PURPOSE: To reduce the size and to improve the performance of a radio repeating amplifier device which shares plural types of systems of mobile telephones and portable telephones.

CONSTITUTION: The down link signal inputted from a base station through an antenna 1 is transmitted through a filter group 21 where a BPF 6 which defines full bands of the down link circuit frequency of plural types of systems contained in an anti-base station shared unit 2 as its pass bands is cascaded to the BPF 1 and 2 which define the inter-system interference areas as their attenuation areas. Then the down link signal is amplified by a common amplifier 4 and transmitted through the BPF 6 of an anti-mobile station shared unit 3 and then an antenna 6. The up link signal inputted from a mobile station through the antenna 6 is amplified by a common amplifier 5 through a BPF 3 which defines the inter-system interference area as its attenuation area as well as a BPF 7 which defines full bands of up link frequency of plural types of systems contained in the shared unit 3 as its pass bands. Then the amplified down link signal is transmitted through the BPF 7 of the unit 2 and the antenna 1.