A refrigerant pipe (R1, R2, R3, R4) for a refrigeration apparatus (A, B), the refrigerant pipe comprising: a first pipe (23, 60, 70) made of stainless steel through which a refrigerant flows; a joint pipe (40, 61, 71) provided on an outer peripheral surface of the first pipe (23, 60, 70) and made of a material different from stainless steel; and a second pipe (41, 50, 51, 62, 63, 72, 73) having a diameter smaller than that of the first pipe (23, 60, 70) and connected to the outer peripheral surface of the first pipe (23, 60, 70) via the joint pipe (40, 61, 71), wherein a surface to be connected (51b, 63a, 73a), which is connected to the joint pipe (40, 61, 71), of the second pipe (41, 50, 51, 62, 63, 72, 73) is made of an identical material to the material of the joint pipe (40, 61, 71); the joint pipe (40, 61, 71) and the surface to be connected (51b, 63a, 73a) of the second pipe (41, 50, 51, 62, 63, 72, 73) are made of copper or a copper alloy, wherein the joint pipe (40, 61, 71) includes a large-diameter portion (40a, 71a), a small-diameter portion (40b, 71a) having a diameter smaller than that of the large-diameter portion (40a, 71a)), and an inclined portion (40c, 71c) connecting the large-diameter portion (40a, 71a) and the small-diameter portion (40b, 71b); characterized in that the joint pipe (40, 61, 71) has an outer peripheral surface connected to the first pipe (23, 60, 70); wherein a first positioning mechanism (40c, 64, 74) that determines a position of the joint pipe (40, 61, 71) with respect to the first pipe (23, 60, 70) is provided on an outer peripheral surface of the joint pipe (40, 61, 71); wherein the small-diameter portion (40b, 71b) is inserted into a hole formed in the first pipe (23, 60, 70); wherein an outer peripheral surface of the inclined portion (40c, 71c) abuts on a peripheral edge of the hole, the inclined portion (40c, 71c) functions as the first positioning mechanism. a first pipe (23, 60, 70) made of stainless steel through which a refrigerant flows; a joint pipe (40, 61, 71) provided on an outer peripheral surface of the first pipe (23, 60, 70) and made of a material different from stainless steel; and a second pipe (41, 50, 51, 62, 63, 72, 73) having a diameter smaller than that of the first pipe (23, 60, 70) and connected to the outer peripheral surface of the first pipe (23, 60, 70) via the joint pipe (40, 61, 71), wherein a surface to be connected (51b, 63a, 73a), which is connected to the joint pipe (40, 61, 71), of the second pipe (41, 50, 51, 62, 63, 72, 73) is made of an identical material to the material of the joint pipe (40, 61, 71); the joint pipe (40, 61, 71) and the surface to be connected (51b, 63a, 73a) of the second pipe (41, 50, 51, 62, 63, 72, 73) are made of copper or a copper alloy, wherein the joint pipe (40, 61, 71) includes a large-diameter portion (40a, 71a), a small-diameter portion (40b, 71a) having a diameter smaller than that of the large-diameter portion (40a, 71a)), and an inclined portion (40c, 71c) connecting the large-diameter portion (40a, 71a) and the small-diameter portion (40b, 71b); characterized in that the joint pipe (40, 61, 71) has an outer peripheral surface connected to the first pipe (23, 60, 70); wherein a first positioning mechanism (40c, 64, 74) that determines a position of the joint pipe (40, 61, 71) with respect to the first pipe (23, 60, 70) is provided on an outer peripheral surface of the joint pipe (40, 61, 71); wherein the small-diameter portion (40b, 71b) is inserted into a hole formed in the first pipe (23, 60, 70); wherein an outer peripheral surface of the inclined portion (40c, 71c) abuts on a peripheral edge of the hole, the inclined portion (40c, 71c) functions as the first positioning mechanism.