Detective Boys

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Detective Boys

Detective Boys Profile.jpg

Japanese name: 少年探偵団
(Shōnen Tantei-dan)
English name: Junior Detective League
Members: Conan Edogawa (leader)
Ai Haibara (second-in-command)
Mitsuhiko Tsuburaya (member)
Ayumi Yoshida (member)
Genta Kojima (member)
Gadgets: Detective Boys Badge
Wristwatch Flashlight
Kamen Yaiba Voice Changer
Guardians: Hiroshi Agasa
Sumiko Kobayashi
Rumi Wakasa
Age: 6-7
Gender: Male and Female
First appearance: Manga: File 17
Anime: Episode 1
Appearances: Detective Boys Appearances

The Detective Boys (少年探偵団 Shōnen Tantei-dan?), also known as The Junior Detective League in the English Funimation adaption, are the pre-adolescent detectives with whom Conan solves the occasional crimes in which he and his Teitan Elementary classmates stumble into.


The Detective Boys were informally founded when Ayumi Yoshida and Genta Kojima decided to investigate a mansion which was once a murder site and had been abandoned. Conan and his classmate Mitsuhiko Tsuburaya were drafted into accompanying the two, and the foursome entered the house. In the course of this adventure, Conan found out that the house was still inhabited by the mother and son of the murder victim; the son had killed his father in a fit of rage over his abusive behavior, and his mother had subsequently locked her own son in a dungeon beneath the house to wait until the deed's time-bar had passed. After Conan succeeded in exposing the two, they were arrested and the case was resolved.[1]

In time, the four kept stumbling into more and more criminal cases, which were resolved thanks to Conan's deductive skills and initiative. Particularly after the case involving a sizable cache of stolen Italian gold coins,[2] Ayumi, Genta and Mitsuhiko developed a taste for detective work and impulsively decided to become investigators themselves, mostly for fame and glory. After advertising their services in school,[3] they have become actively involved in many criminal cases provided by their schoolmates, though more often than not they keep accidentally coming upon such during their free-time activities. Some time later, their new classmate (and former Black Organization member) Ai Haibara was drafted into the group. Two adults also joined this group informally, namely Professor Hiroshi Agasa, who provides the group with special gadgets to aid them in their adventures, and their class teacher Sumiko Kobayashi, a mystery novel enthusiast who proclaimed herself their manager.

In most cases, the Detective Boys act more like aides to Conan, who is the group's (mostly undisputed) leader due to his intelligence, extensive criminal knowledge and experience. In this role they function mostly as additional pairs of eyes who provide Conan with trivial-seeming but important clues, and display little investigative brilliance or determination of their own. As the series progresses, however, the other members, particularly Ai and Mitsuhiko, have demonstrated in some cases - especially where Conan is not present or out of commission - that the Detective Boys have the potential of becoming skilled investigators in their own right. Famous cases of such include:





Note: Caution must be advised for OVAs, movies and TV originals, as these are essentially non-canonical with the manga series and therefore not 100% diagnostically conclusive.



Relationship analysis[edit]

Family and friends[edit]

Hiroshi Agasa[edit]

The Detective Boys love Professor Hiroshi Agasa very much and they have a good familial relationship with each other. Professor Agasa has invented the 'Wristwatch Flashlight' and the 'Detective Boys Badge' to help them in their deductions and to contact each other in any situation that might come up.

Agasa, in turn, seems to consider the actual children of the group as surrogate grandchildren, and is willing to help them with various cases.

Sumiko Kobayashi[edit]

Sumiko Kobayashi is the current teacher of the class that the Detective Boys are in. She also proclaims herself to be their manager, much to the children's chagrin.

Rumi Wakasa[edit]

Since becoming assistant teacher in the Detective Boys' class, she has gone on a number of outings with them. She is secretly highly skilled at fighting and has protected the Detective Boys on a number of occasions. She also has very sharp deduction skills and has had to drop hints for Conan on the cases they've had together. However, there are indications that she is using the Detective Boys to her own ends.

Ran Mouri[edit]

Kogoro Mouri[edit]


  • Genta refers to Conan as his apprentice in various episodes, mainly to show off to people.[4]
  • In an interview, Gosho Aoyama stated that the purpose of the Detective Boys was to act as a cover for Haibara.
  • Conan has notebook with the Detective Boys badge symbol on it as shown in Episode 231.
  • The Detective Boys in Detective Conan and Nobita and his friends in Doraemon both share a lot of resemblance.
    • Interestingly enough, Ai Haibara also draw parallel to Doraemon's sister Dorami, being a wise and intelligent member.

In other languages[edit]

Language Name
Flag of Japan Japanese 少年探偵団 Shōnen Tantei-dan
Flag of Arab League Arabic فريق التحرّيات الصغير / فريق المحقّقين الصغار Farīq At-Taḥarriyāt Aṣ-Ṣaghīr / Farīq Al-Muḥaqqiqīn Aṣ-Ṣighār[5]
Flag of US English Junior Detective League
Flag of South Korea Korean 어린이 탐정단 Eo-rin-i Tam-jeong-dan
Flag of France French Détective Junior
Flag of Philippines Filipino Junior Detective Squad
Flag of Indonesia Bahasa Indonesia Grup Detektif Cilik
Flag of Malaysia Bahasa Malaysia Kumpulan Detektif Muda
Flag of Germany German Detective Boys
Flag of Spain Spanish Liga Juvenil de Detectives
Flag of Galicia Galician Liga de Detectives Xuvenís
Flag of Catalonia Catalan Lliga de Detectius Júnior
Flag of Italy Italian Squadra dei Giovani Detective
Flag of Vietnam Vietnamese Đội Thám Tử Nhí (manga)
Đội Thám Tử Tí Hon (anime)
Flag of China Chinese 少年侦探团 shào nián zhēn tàn tuán
Flag of Republic of China Tradtional Chinese 少年偵探團 shào nián zhēn tàn tuán
Flag of Thailand Thai ขบวนการนักสืบเยาวชน K̄hbwnkār nạks̄ụ̄b yeāwchn


See also[edit]


  1. ^ Manga Chapters 17-19, Anime Episode 20: Scary Building Case
  2. ^ Manga Chapters 36-39: Code Sheet Case
  3. ^ Manga Chapter 56: Formation! The Detective Boys
  4. ^ Anime Episode 129: The Girl from the Black Organization and the University Professor Murder Case
  5. ^ First called (Investigations Junior Team) then changed to (Junior Detectives Team).
  6. ^ OVA 9: The Stranger from Ten Years Later
Detective Boys
Members Conan EdogawaAi HaibaraAyumi YoshidaMitsuhiko TsuburayaGenta Kojima
Guardians Hiroshi AgasaSumiko KobayashiRumi Wakasa
Gadgets Detective Boys BadgeWristwatch Flashlight