A laser surveying system comprising: a rotational light emitting unit configured to rotationally emit a laser beam, comprising a case and a beam emitter supported on the case with an optical axis (Ai) of the laser beam rotatable relative to the case; and a light receiving unit configured to receive the laser beam from the rotational light emitting unit and perform surveying of a light-receiving position, wherein the rotational light emitting unit comprises an emit-side controller to determine a rotational position of the optical axis (Ai) of the laser beam relative to the case; wherein: the light receiving unit comprises a receive-side controller configured to acquire the rotational position of the optical axis (Ai) from the emit-side controller and an angle of site (θv) of the laser beam relative to a reference plane (Pb) formed by the optical axis (Ai) in rotation about the rotational axis (Ar) of the beam emitter from the laser beam; the case includes a column that is configured such that the optical axis crosses over the column when rotated by the beam emitter; and the receive-side controller is configured to specify a state of the laser beam received by the light receiving unit, the state of the laser beam being defined by the rotational position of the optical axis (Ai) and the angle of site (θv) and to determine, according to the specified state, whether or not the laser beam is in a light shielding area (As) defined by a positional relationship between the column and the beam emitter, to thereby determine whether or not the laser beam received by the light receiving unit has been blocked. a rotational light emitting unit configured to rotationally emit a laser beam, comprising a case and a beam emitter supported on the case with an optical axis (Ai) of the laser beam rotatable relative to the case; and a light receiving unit configured to receive the laser beam from the rotational light emitting unit and perform surveying of a light-receiving position, wherein the rotational light emitting unit comprises an emit-side controller to determine a rotational position of the optical axis (Ai) of the laser beam relative to the case; wherein: the light receiving unit comprises a receive-side controller configured to acquire the rotational position of the optical axis (Ai) from the emit-side controller and an angle of site (θv) of the laser beam relative to a reference plane (Pb) formed by the optical axis (Ai) in rotation about the rotational axis (Ar) of the beam emitter from the laser beam; the case includes a column that is configured such that the optical axis crosses over the column when rotated by the beam emitter; and the receive-side controller is configured to specify a state of the laser beam received by the light receiving unit, the state of the laser beam being defined by the rotational position of the optical axis (Ai) and the angle of site (θv) and to determine, according to the specified state, whether or not the laser beam is in a light shielding area (As) defined by a positional relationship between the column and the beam emitter, to thereby determine whether or not the laser beam received by the light receiving unit has been blocked. the light receiving unit comprises a receive-side controller configured to acquire the rotational position of the optical axis (Ai) from the emit-side controller and an angle of site (θv) of the laser beam relative to a reference plane (Pb) formed by the optical axis (Ai) in rotation about the rotational axis (Ar) of the beam emitter from the laser beam; the case includes a column that is configured such that the optical axis crosses over the column when rotated by the beam emitter; and the receive-side controller is configured to specify a state of the laser beam received by the light receiving unit, the state of the laser beam being defined by the rotational position of the optical axis (Ai) and the angle of site (θv) and to determine, according to the specified state, whether or not the laser beam is in a light shielding area (As) defined by a positional relationship between the column and the beam emitter, to thereby determine whether or not the laser beam received by the light receiving unit has been blocked. to specify a state of the laser beam received by the light receiving unit, the state of the laser beam being defined by the rotational position of the optical axis (Ai) and the angle of site (θv) and to determine, according to the specified state, whether or not the laser beam is in a light shielding area (As) defined by a positional relationship between the column and the beam emitter, to thereby determine whether or not the laser beam received by the light receiving unit has been blocked.