To provide a rocking toy which provides high excitement and an assembling method of the rocking toy.

The rocking toy is provided inside a shell body with a pendulum equipped with a permanent magnet, an electric magnet which applies magnetic force to the permanent magnet of the pendulum, and an electric magnet controlling means for controlling the electric magnet and is composed in a way that a grounded part can be moved to keep the direction of the pendulum changeable, and the installing position of the electric magnet changeable in accordance with the change in the direction of the pendulum so that the rocking direction of the shell body can be changed.