A base station device, comprising: reference installation direction storage means arranged to store at least one reference installation direction serving as a reference installation direction for the base station device; inclination judgment means arranged to calculate inclination angles each defined by each reference installation direction stored in the reference installation direction storage means and an installation direction of the base station device, and to judge whether each of the inclination angles exceeds a predetermined value; installation direction measuring means arranged to measure the installation direction of the base station device; and installation error alarm means arranged to issue a predetermined alarm when the inclination judgment means judges that some or all of the inclination angles exceed the predetermined value characterized in that the reference installation direction storage means is arranged to pre-store, as said at least one reference installation direction as a normal installation direction prior to installing the base station device to a field, x-, y-, and z-direction components of a gravity acceleration vector measured by the installation direction measuring means with the base station device installed in the normal installation direction; and the inclination judgment means is arranged to judge, at the time of the installation of the base station device to the field, whether each of the inclination anglesexceeds the predetermined value based on each reference installation direction pre-stored in the reference installation direction storage means prior to the installation of the base station device to the field. reference installation direction storage means arranged to store at least one reference installation direction serving as a reference installation direction for the base station device; inclination judgment means arranged to calculate inclination angles each defined by each reference installation direction stored in the reference installation direction storage means and an installation direction of the base station device, and to judge whether each of the inclination angles exceeds a predetermined value; installation direction measuring means arranged to measure the installation direction of the base station device; and installation error alarm means arranged to issue a predetermined alarm when the inclination judgment means judges that some or all of the inclination angles exceed the predetermined value characterized in that the reference installation direction storage means is arranged to pre-store, as said at least one reference installation direction as a normal installation direction prior to installing the base station device to a field, x-, y-, and z-direction components of a gravity acceleration vector measured by the installation direction measuring means with the base station device installed in the normal installation direction; and the inclination judgment means is arranged to judge, at the time of the installation of the base station device to the field, whether each of the inclination anglesexceeds the predetermined value based on each reference installation direction pre-stored in the reference installation direction storage means prior to the installation of the base station device to the field.