Electric actuator

An electric actuator, comprising:

• a motor part comprising a motor shaft extending in an axial direction;
• a deceleration mechanism connected to one axial side of the motor shaft;
• an output part comprising an output shaft to which rotation of the motor shaft is transmitted via the deceleration mechanism;
• and
• a housing accommodating the motor part, the deceleration mechanism, and the output part,
• wherein the output shaft extends in the axial direction of the motor shaft and is arranged away from the motor shaft when viewed along the axial direction,
• the deceleration mechanism comprises an output gear to which rotation of the motor shaft is decelerated and transmitted,
• the output part comprises a drive gear which is fixed to the output shaft and meshes with the output gear,
• the output gear comprises a first meshing part which meshes with the drive gear,
• the drive gear extends toward the output gear and comprises a second meshing part which meshes with the first meshing part at a tip end,
• the first meshing part and the second meshing part mesh with each other within a range from a first rotation angle to a second rotation angle of a rotation angle of the output shaft, and
• a ratio between a first distance from a meshing position where the first meshing part meshes with the second meshing part to a central axis of the motor shaft, and a second distance from the meshing position to a central axis of the output shaft, when viewed along the axial direction, changes in at least a portion of the range from the first rotation angle to the second rotation angle.