To provide a driving unit for a toy, which is detachable from the moving toy body or a part of the toy, and is enjoyable various toy characters in low price.

A driving unit 3 for toy is a unit of a holder block to hold a driving power source 6 like a power spring or a driven block 4, which is connected to the holder block 4 and can repeat relative action to the holder block 4. Because the holder blocks 4, etc. has an engagement structure with the toy body 1, the toy body part, etc. has become freely changeable.