A film deposition apparatus includes: a turntable; a first reaction gas supply part and a second reaction gas supply part extending from a circumferential edge toward a rotation center of the turntable; and a first separation gas supply part provided between the first and second reaction gas supply parts. A first space contains the first reaction gas supply part and has a first height. A second space contains the second reaction gas supply part and has a second height. A third space contains a first separation gas supply part and has a height lower than the first and second heights. A motor provided under the rotation center of the turntable rotates the turntable. A rotation shaft of the turntable and a drive shaft of the motor are coupled without generation of slip.