To provide a bicycle drive crank pedal angle advancing device capable of reducing the invalid labor in the vicinity of a top dead center of a pedal when a bicycle travels, and having the function for enjoying the efficient and comfortable cycling.

The bicycle drive crank pedal angle advancing device makes the angle advance of the top dead center of a pedal by dividing a crank shaft into right and left portions 5, 6, and connecting them to offset gears 7B, 7C on a coupling shaft 8, and offset gears 7A, 7D on the crank shafts 5A, 5B.