A linear actuator (1) comprises an electromagnetic block (10) which functions as an electromagnet, a plurality of magnetic blocks (20a, 20b) including a permanent magnet, and an output axle (30) which is disposed upon one of the plurality of magnetic blocks (20a, 20b). The plurality of magnetic blocks (20a, 20b) are disposed in parallel, and move reciprocally in an inverse phase when current is applied to the electromagnetic block (10). The output axle (30) has an axial direction of the reciprocal movement direction of the magnetic block.本發明之線性致動器包含:作為電磁鐵之機能之電磁塊、包含永久磁鐵之複數磁塊、及設置於複數磁塊中之其中之一之輸出軸。複數之磁塊係並排設置,且當電流供給到電磁塊時,彼此以逆相位往返移動。輸出軸於磁塊之往返移動方向具有軸方向。1‧‧‧線性致動器10‧‧‧電磁塊20‧‧‧磁塊30‧‧‧輸出軸
