PROBLEM TO BE SOLVED: To provide a yoyo to be played with interest for a long time by providing an integrated circuit with a speaker generating sound in the inside of rotors in the yoyo formed of a string and the rotors. SOLUTION: A melody yoyo is constituted of a pair of rotors A, B and side boards 10, 10 formed of synthetic resin, light metal, etc. An integrated circuit 1 to which a speaker D is connected by a wiring cord E is incorporated in the rotor A. The integrated circuit 1 is provided with an electronic circuit device which generates music sound, music, or rhythmic sound by a centrifugal switch responding to the rotation in rotating the rotor A. The centrifugal switch 2 which has a weight 15 in one end cooperates with a U-shaped armature 3 forming a pair of angle contacts which are pressed in the inside face of the rotor A, and is brought in contact with the both contacts of the armature 3 at all times in the rotation by the centrifugal force of the normal/reverse rotation of the rotor A so as to start the integrated circuit and continuously generate the sound.
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