Actuator, and actuator and system that present perceptible output

An actuator, comprising:

• a movable body including:
• a disk-shaped magnet,
• a pair of disk-shaped yokes fixed to front and back surfaces of the disk-shaped magnet,
• a pair of spring retaining parts connected at one ends to the disk-shaped yokes, respectively, and connected at other ends to central portions of circular leaf springs, respectively, and
• a protruding part protruding in an axial direction of the disk-shaped magnet from the other end of one spring retaining part of the pair of spring retaining parts;
• and
• a fixing body including:
• a coil disposed at an outer circumference of the movable body, and
• a case including an opening portion through which the protruding part is inserted, the case accommodating the coil and the movable body such that a protruding end side of the protruding part protrudes to an outside, the fixing body being configured to support the movable body movably in the axial direction of the disk-shaped magnet via the circular leaf springs.