To solve the problem that a state at a collision cannot be realistically reproduced since a conventional bicycle itself used in a collision experiment, etc., is not broken.

Bicycle parts such as a frame, a front wheel, a rear wheel, a handle bar a saddle and a pedal, etc., are formed of materials such as rubber and resin, which are hardly damaged upon a shock. The parts can be disassembled/assembled. All or a part of assembled parts are connected by a wire, a string and a spring to prevent the parts from being scattered even if the parts get out of the assembly. A power source is incorporated into the bicycle, thus making the bicycle self-propellable.