An air chuck comprising: a finger support part including a pair of fingers (5, 5) that is openable and closable; a chuck main body part including an operation mechanism operable to open and close the pair of fingers (5, 5); and linking mechanisms that detachably link the finger support part to the chuck main body part, wherein the finger support part includes two linking shafts (13, 13) extending in parallel from the finger support part, and the two linking shafts (13, 13) are provided with the two respective linking mechanisms, and the linking mechanisms each include: a catch surface formed on the linking shaft; a shaft insertion hole formed in a body of the chuck main body part for insertion of the linking shaft; a catch body that becomes elastically caught on the catch surface of the linking shaft so as to link the linking shaft to the chuck main body part when the linking shaft is inserted into the shaft insertion hole; characterised in that the air chuck also comprises a delinking member (70, 80) that is manually operated so as to release the catch body caught on the catch surface when the finger support part is detached from the chuck main body part, wherein the linking mechanisms each include: the at least one catch body received in a catch-body reception hole formed in a hole wall of the shaft insertion hole in a manner so as to be capable of shifting between a catch position where the catch body is caught on the catch surface of the linking shaft and a non-catch position where the catch body is off the catch surface; a press member capable of shifting between a press position where the press member presses the catch body toward the catch position and a non-press position where the press member does not press the catch body; and a press spring that exerts energizing force on the press member toward the press position, and wherein the catch body is a sphere, and the press member is cylindrical and is disposed around the shaft insertion hole and the catch body in a manner so as to be capable of advancing and retreating in a direction of an axis of the shaft insertion hole, a taper surface is formed as an inner surface of the press member, the taper surface presses the catch body toward the catch position when the press member advances to the press position, and the taper surface releases the catch body from pressing force when the press member retreats to the non-press position. the finger support part includes two linking shafts (13, 13) extending in parallel from the finger support part, and the two linking shafts (13, 13) are provided with the two respective linking mechanisms, and the linking mechanisms each include: a catch surface formed on the linking shaft; a shaft insertion hole formed in a body of the chuck main body part for insertion of the linking shaft; a catch body that becomes elastically caught on the catch surface of the linking shaft so as to link the linking shaft to the chuck main body part when the linking shaft is inserted into the shaft insertion hole; characterised in that the air chuck also comprises a delinking member (70, 80) that is manually operated so as to release the catch body caught on the catch surface when the finger support part is detached from the chuck main body part, wherein the linking mechanisms each include: the at least one catch body received in a catch-body reception hole formed in a hole wall of the shaft insertion hole in a manner so as to be capable of shifting between a catch position where the catch body is caught on the catch surface of the linking shaft and a non-catch position where the catch body is off the catch surface; a press member capable of shifting between a press position where the press member presses the catch body toward the catch position and a non-press position where the press member does not press the catch body; and a press spring that exerts energizing force on the press member toward the press position, and wherein the catch body is a sphere, and the press member is cylindrical and is disposed around the shaft insertion hole and the catch body in a manner so as to be capable of advancing and retreating in a direction of an axis of the shaft insertion hole, a taper surface is formed as an inner surface of the press member, the taper surface presses the catch body toward the catch position when the press member advances to the press position, and the taper surface releases the catch body from pressing force when the press member retreats to the non-press position.