A laser processing apparatus having a holding unit for holding a workpiece to be processed and a processing unit for applying a laser beam to the workpiece held by the holding unit. The processing unit includes an oscillator for oscillating the laser beam, a focusing lens for focusing the laser beam oscillated by the oscillator toward the workpiece, and a focal position adjusting mechanism for adjusting the focal position of the laser beam focused by the focusing lens. The focal position adjusting mechanism includes a movable unit having a permanent magnet and supporting the focusing lens, a fixed portion having a coil for moving the movable unit in a direction perpendicular to the workpiece and a gas bearing for supporting the movable unit by using a gas, and a supporting member for supporting the movable unit from the under side by using a magnetic repulsive action.