To provide the mount device for an antenna to a pole simply and accurately in one operation without the use of a machine screw.

An antenna pole 7 is inserted between a 1st holder 5 that is provided with a pressing piece 11 energized by an elastic body 10 pressing a semi-cylindrical mount face 9, provided with guide holes 15 at the left and the right sides of the mount face 9 and having lock projections 14 in the inside and that is attached to a mount section 2 provided to a rear side of a reflection plate 1 and a 2nd holder 6 that is provided with a semi-cylindrical mount face 16 opposite to the 1st holder 5 and provided with fulcrums 17 to the left and right sides of the mount face 16 and is provided with a lock arm 12 energized by an elastic body 18, fitted turnably by removal buttons 19 at both side faces and having sawtooth lock projections 13 at the lock ends to hold the antenna pole 7 in-between.