A chemical liquid supplying apparatus 10 has a bellows 11, which includes a small-size bellows portion 13, a large-size bellows portion 14 with a larger volume change per axial-directional unit displacement amount than that of the small-size bellows portion 13, and a drive portion 12 therebetween. An apparatus main body 10a to which the bellows 11 is attached includes a supporting member 21 to which a fixed end portion 15 of the bellows 11 is attached and a supporting member 22 to which a fixed end portion 16 of the bellows 11 is attached. A drive sleeve 27 surrounds the bellows 11 and is rotatably supported on the apparatus main body 10a. A driven cylinder body 32 attached to the drive portion 12 converts rotation of the drive sleeve 27 to axial-directional movement of the drive portion 12.