Provided is a tablet filling device capable of continuing an operation without stopping the supply of the tablet container, filling with tablets, etc. even when the prescribed operations cannot be performed at the operating positions. The tablet filling device includes: a tablet supply unit (3) that fills a tablet container (12) with tablets; a carrying member (41) which carries the tablet cassette (12) from the tablet supply unit (3) to a standby position; a container holding member (65) provided at a delivery position and having a plurality of holding parts (67, 68) capable of holding the tablet container (12) according to a difference in outer diameter dimension; and another carrying member (52) which carries the tablet container (12) held by a container holding member (65) to an operating position.