The present invention provides a heliostat apparatus including one mirror frame that supports a reflecting mirror; a pair of north-south rotational shafts to rotate the mirror frame in the north-south direction; an east-west rotational shaft to rotate the mirror frame in the east-west direction with the north-south direction as the rotational axis direction; a pair of arms projecting from the east-west rotational shaft to the east and to the west; an east-west rotational shaft support that allows the axial rotation of the east-west rotational shaft; and the pair of the north-south rotational shafts positioned to face each other on the ends of the pair of the arms; wherein the rotation of the mirror frame, etc. as an integrated unit in the east-west direction with the east-west rotational shaft as the rotational axis adjusts the east-west angle of a reflecting surface of the reflecting mirror; and with the north-south rotational shaft as the rotational axis, the rotation of the mirror frame in the north-south direction adjusts the north-south angle of the reflecting surface of at least one reflecting mirror. With this mechanism, a lower-cost heliostat apparatus can be provided.