Wanpaku Tanteidan
Japanese title: わんぱく探偵団
Type: TV
Episodes: 35
Premiered: winter 1968
Source: Unknown
Genres: Action, Mystery
Studios: Mushi Production
Producers: Fuji TV
Duration: 25 min per ep
Rating: PG-13 - Teens 13 or older

A group of young boys (plus a token girl and her little brother, the obligatory brat) form a detective club, pooling their talents for brain, brawn, invention, and driving skills to solve crimes in Tokyo. Much to the consternation of police chief Nakamura, they often succeed where the professionals fail.

(Source: The Anime Encyclopedia)