A colonoscope having an egg-shaped camera module and a wiring unit, as well as a forward movement control method of the colonoscope, are disclosed. The camera module includes a casing, a first camera unit, a vibration motor and a control unit. The casing has first and second ends. The first end is made of a transparent material. The first camera unit captures a first image. The vibration motor is adapted to vibrate the casing. The control unit controls the first camera unit to capture the first image. The control unit controls the vibration of the vibration motor. The wiring unit forms a vent and includes at least two lead wires and an air tube. Power can be transmitted to the control unit through the lead wires. The air tube is adapted to convey air, and the vent is adapted to output the air to a colon.
