A drive device comprising: an actuator (320x, 320y) that includes a piezoelectric element (323x, 323y) having as a whole an elongated shape and at least two drivers (321x, 322x, 321y, 322y) that are arranged on the piezoelectric element (323x, 323y) along an axis parallel to a central axis of the piezoelectric element (323x, 323y); a fixed member (301, 302) on which the actuator (320x, 320y) is arranged, the fixed member having a first groove (305x, 305y) parallel to the central axis of the piezoelectric element; a movable member (311x, 311y) that moves by the drivers (321x, 322x, 321y, 322y) on the fixed member (301, 302), the movable member having a second groove (334x, 334y) parallel to the central axis of the piezoelectric element; two balls (337x, 338x, 337y, 338y) that are located between a pair of grooves formed by the first and second grooves to support the movable member (311x, 311y) that moves on the fixed member (301, 302); a pressing mechanism (340x, 340y) that presses the actuator toward the movable member to hold the two balls between the pair of grooves; one ball that is arranged at a position different from the two balls to maintain a spacing between the fixed member and the movable member; and a spring that is arranged in the vicinity of the one ball and biases the movable member to the fixed member to hold the one ball between the movable member and the fixed member, wherein the two balls and the one ball are arranged such that the movable member is three-point supported with respect to the fixed member, the two balls move along the pair of grooves while being held therebetween, and a positional relation between the drivers (321x, 322x, 321y, 322y) and the two balls (337x, 338x, 337y, 338y) is defined such that the drivers (321x, 322x, 321y, 322y) are located between the two balls (337x, 338x, 337y, 338y) in the direction parallel to the central axis of the piezoelectric element (323x, 323y) even when the movable member (311x, 311y) moves to a maximum extent on the fixed member (301, 302). an actuator (320x, 320y) that includes a piezoelectric element (323x, 323y) having as a whole an elongated shape and at least two drivers (321x, 322x, 321y, 322y) that are arranged on the piezoelectric element (323x, 323y) along an axis parallel to a central axis of the piezoelectric element (323x, 323y); a fixed member (301, 302) on which the actuator (320x, 320y) is arranged, the fixed member having a first groove (305x, 305y) parallel to the central axis of the piezoelectric element; a movable member (311x, 311y) that moves by the drivers (321x, 322x, 321y, 322y) on the fixed member (301, 302), the movable member having a second groove (334x, 334y) parallel to the central axis of the piezoelectric element; two balls (337x, 338x, 337y, 338y) that are located between a pair of grooves formed by the first and second grooves to support the movable member (311x, 311y) that moves on the fixed member (301, 302); a pressing mechanism (340x, 340y) that presses the actuator toward the movable member to hold the two balls between the pair of grooves; one ball that is arranged at a position different from the two balls to maintain a spacing between the fixed member and the movable member; and a spring that is arranged in the vicinity of the one ball and biases the movable member to the fixed member to hold the one ball between the movable member and the fixed member, wherein the two balls and the one ball are arranged such that the movable member is three-point supported with respect to the fixed member, the two balls move along the pair of grooves while being held therebetween, and a positional relation between the drivers (321x, 322x, 321y, 322y) and the two balls (337x, 338x, 337y, 338y) is defined such that the drivers (321x, 322x, 321y, 322y) are located between the two balls (337x, 338x, 337y, 338y) in the direction parallel to the central axis of the piezoelectric element (323x, 323y) even when the movable member (311x, 311y) moves to a maximum extent on the fixed member (301, 302).