Abstract: A rotary screwdriver with hidden and replaceable screwdriver bits, including a grip and a push member. The push member has an engaging section. A roller is disposed in the grip in an eccentric position. The roller is formed with multiple receiving tunnels which are annularly arranged at intervals. A screwdriver bit is received in each receiving tunnel. Each screwdriver bit is formed with an insertion section corresponding to the engaging section for engaging with the push member. By means of rotating the roller, the push member can be engaged with a desired screwdriver bit of the multiple screwdriver bits. By means of pushing the push member, the screwdriver bit engaged with the push member is pushed out of the outlet and located for use or retracted into the receiving tunnel.