A tube assembly (60) includes an inner tube (70), an outer tube (80), and a brazing material (61). The inner tube (70) includes an outer peripheral surface first portion (71) and an outer peripheral surface second portion (72). The inner tube (70) constitutes a refrigerant passage of a compressor (11). The outer tube (80) includes an inner peripheral surface first portion (81) and an inner peripheral surface second portion (82). The outer tube (80) constitutes an injection path (54). The inner tube (70) is partially inserted into the outer tube (80) such that the outer peripheral surface first portion (71) is in contact with the inner peripheral surface first portion (81). The brazing material (61) is disposed in a brazing gap (65) between the outer peripheral surface second portion (72) and the inner peripheral surface second portion (82). The brazing material (61) fixes the outer peripheral surface second portion (72) and the inner peripheral surface second portion (82).