Electric actuator

An electric actuator, comprising:

• a motor which comprises:
• a rotor having a motor shaft extending along a central axis;
• and
• a stator facing the rotor in a radial direction;
• and
• a deceleration mechanism connected to one axial-direction side of the motor shaft,
• wherein the motor comprises a motor case having a first opening end surface that opens on the one axial-direction side,
• the deceleration mechanism comprises a deceleration mechanism case having a second opening end surface that opens on an other axial-direction side,
• the motor case and the deceleration mechanism case are connected in an axial direction via an annular sealing member disposed between the first opening end surface and the second opening end surface,
• the first opening end surface comprises a first end surface body part in a circular arc shape extending in a circumferential direction, and a first end surface protrusion part protruding in an arc shape from the first end surface body part toward a radial-direction outer side,
• the second opening end surface comprises a second end surface body part in a circular arc shape extending in the circumferential direction, and a second end surface protrusion part protruding in an arc shape from the second end surface body part toward the radial-direction outer side and facing the first end surface protrusion part,
• the sealing member comprises a body part sealing part disposed between the first end surface body part and the second end surface body part, and a protrusion part sealing part disposed between the first end surface protrusion part and the second end surface protrusion part,
• the protrusion part sealing part comprises an axial-direction protrusion that protrudes from a surface directed to the axial direction toward the one axial-direction side or the other axial-direction side, and
• the axial-direction protrusion faces a side surface of the motor case in the first end surface protrusion part or a side surface of the deceleration mechanism case in the second end surface protrusion part in the circumferential direction.