A gas laser device in which a laser medium gas is circulated in an airtight container and a laser beam is generated from the gas excited by an electric discharge, includes a main unit (10) including an air blower (13) for circulating the gas, heat exchangers (12a, 12b) for cooling the gas, and a discharging power supply (11). A laser beam emitter (20) includes a discharging unit (23) and resonator reflecting mirrors (21a, 21b). The main unit (10) and the laser beam emitter (20) are separate and spaced from each other. The main unit (10) and the laser beam emitter (20) are interconnected by a gas pipe assembly having a plurality of highly rigid steel pipes and flexible, expandable/contractable, airtight connector members (31a, 31b) connecting the steel pipes.