To provide a dynamic apparatus for a bicycle which can suppress the generation of noises during the operation.

Mounting plates 57 and 58 are arranged facing each other at lower parts of first leg parts 20 and 21 composing a frame 12. An arm 54 is fixed on a load resistance generator 53 of a resistance applicator 13. A fixing member 56 rotatably supporting the arm 54 is fixed on the mounting plate 57. A rotary drive wheel 55 disposed on the arm 54 is provided with a pulley 70 and a transmission wheel 71 integrally rotating therewith. The transmission wheel 71 is pressed onto a rim side of a bicycle by an energizing force of a coil spring provided between the fixing member 56 and the arm 54. A load resistance generated by the load resistance generator 53 is transmitted to the rear wheel of the bicycle through a belt 73, the pulley 70 and the transmission wheel 71.