Patent ID: 7319515

Claim:
A rotary laser apparatus, comprising: a light-projection section configured to irradiate at least two fan-shaped beams extending in a fan-shaped form in a direction orthogonal to a rotary axis; a laser beam source configured to generate a laser beam in a direction of the rotary axis; a rotation-irradiating section configured to rotatably irradiate the laser beam from the laser beam source in directions orthogonal to the rotary axis; a plurality of penta prisms provided in the rotation-irradiating section and arranged in the direction of the rotary axis correspondingly to the number of said fan-shaped beams such that light-emitting directions of the respective penta prisms differ from each other or one another; a beam splitter configured to divide the laser beam which a corresponding one of the penta prisms requires; and a fixing member configured to press the penta prisms and the beam splitter against the rotation-irradiating section, such that the penta prisms and the beam splitter are fixed to the rotation-irradiating section under pressure.