The substrate holding/rotating device includes a plurality of movable pins each having a support portion in contact with a peripheral edge portion of the substrate to support the substrate, and a rotation unit which rotates the plurality of movable pins around the rotation axis, a support portion of each of the movable pins included in a first pin group is disposed so as to move between a first hold position included hold positions, the first hold position close to a rotation axis and a second hold position included the hold positions, the second hold position far apart from the first hold position to one in a circumferential direction and also so as to move between the first and second hold positions and an open position far apart from the rotation axis.