The bicycle mid-motor and electric assist bicycle are related to the technical field of the electric assist bicycle, and among the existing bicycle mid-motors, the torque sensor structure is complex and solves the technical problem of low measurement accuracy. The bicycle mid-motor includes a motor casing (011); A motor inner stator 012 fixed in the motor casing 011 through the inner stator frame; A motor outer rotor 013 mounted to the inner stator frame; A motor body output shaft 014 integrally connected to the motor outer rotor 013; A first planetary gear mechanism 015 installed inside the inner stator frame and increasing and outputting an input of a manpower; An elastic body (031) fixedly mounted in the inner stator frame and connected to the ring gear of the first planetary gear mechanism (015); It is installed on the elastic body 031 and includes a torque sensor 032 for detecting the pedal effort of the rider provided to the bicycle.
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