PURPOSE: To facilitate tilt adjustment and to reduce weight and wind pressure load by sticking and fixing both side parts of a reflector to the inner periphery of an antenna cover.

CONSTITUTION: An antenna fixing part 21 is constituted to erect a column member 22 with length corresponding to about a half of an antenna cover 6 for a mobile communication base station antenna 1 and fix tilt fittings 11 to the upper and lower ends of the member 22. The lower end part of the cover 6 is fixed to an outside circular arc member 9 for the lower end tilt fitting 11 and the center part of the cover 6 is fixed to an outside circular arc member 9 for the upper end fitting 11. Namely, the antenna 1 is supported at two points. Since both side parts 4a of a reflector 4 are stuck and fixed to the inner periphery of the cover 6 in the antenna 1, the rigidity strength of the cover 6 is compensated by the rigidity of the reflector 4. Thereby even when the cover 6 is fixed at two points, i.e., the lower end part and the center part, deflection due to wind pressure is not caused and electric performance can be effectively maintained.