A
linear actuator has improved output performance and can be assembled with high precision. The
linear actuator includes: a yoke part where yoke components, where a hollow is formed between an outer circumferential surface of a first yoke provided on one side of a ring-shaped permanent
magnet and an inner circumferential surface of a second yoke provided on another side of the ring-shaped permanent
magnet, are combined on an outer circumference of a guide
pipe with end surfaces of the first yokes and / or end surfaces of the second yokes being in contact and
magnetic poles formed in facing yoke surfaces having a same polarity; and a shaft-linked part where a coil
bobbin, which is disposed in the hollow of the yoke part and around which a coil has been wound, and a shaft inserted into the guide
pipe are linked. By switching the direction of the current flowing in the coil, relative movement between the yoke part and the shaft-linked part is reciprocally caused in an axial direction.