The invention realizes a CATV repeater which has a reduced distance from a coaxial connector of a coaxial cable to a receptacle on a printed circuit board of an amplifier to prevent deterioration of the high frequency characteristic and besides facilitates connection and is tough against an outdoor environment. Receptacle 32 of amplification device 30 can be inserted into guide metal member 11 of body case 10, and the core of receptacle 32 is connected to core 21 of coaxial connector 20 of a coaxial cable by L-shaped connection pin 13. L-shaped connection pin 13 includes connection pin 13b having, at an end thereof, a cylindrical pin to be fitted with the receptacle of the amplifier and having, at the other end thereof, a U-shaped portion, and connection pin 13a having, at an end portion thereof, a hollow cylindrical portion with a pair of slits on the coaxial cable side and having, at the other end portion thereof, a cylindrical connection portion with ring-shaped projections with which the positioning of the U-shaped portion of connection pin 13b is set in a limited position.