It is an object of the present invention to provide a highly interesting toy. A toy transformable between a first form and a second form includes a first outer shell part, a second outer shell part configured to be coupled to the first outer shell part, and a third outer shell part configured to be coupled to the first outer shell part and the second outer shell part. The first outer shell part and the second outer shell part are configured to be coupled to each other with the third outer shell part interposed therebetween in the first form and to be coupled to each other without the third outer shell part interposed therebetween in the second form.