A refrigerant valve device comprising: a base which is provided with a refrigerant inlet port, a refrigerant outlet port and a valve seat face on which at least one of the refrigerant inlet port and the refrigerant outlet port is opened; a cover configured to section a valve chamber communicating with the refrigerant inlet port and the refrigerant outlet port between the base and the cover; a valve body which is turnably disposed in an inside of the valve chamber provided with a contact face sliding on the valve seat face; and a valve body drive mechanism structured to turn the valve body around an axial line which is perpendicular to the valve seat face; wherein the valve body drive mechanism turns the valve body and thereby a refrigerant flowing passage from the refrigerant inlet port to the refrigerant outlet port through the valve chamber is switched at least to a first refrigerant flowing passage and to a second refrigerant flowing passage; and wherein a refrigerant flowing amount flowing through the first refrigerant flowing passage is smaller than a refrigerant flowing amount flowing through the second refrigerant flowing passage; characterized in that: the valve body is turnably disposed at a position as a turning center shifted to a side of one port of the refrigerant inlet port and the refrigerant outlet port; the valve body drive mechanism comprises a drive source and a gear train with an output gear which transmits a drive force of the drive source to the valve body, such that when the valve body is integrally turned together with the output gear, the refrigerant flowing passage between the valve chamber and the one port of the refrigerant inlet port and the refrigerant outlet port is switched to the first refrigerant flowing passage and to the second refrigerant flowing passage, and the other port of the refrigerant inlet port and the refrigerant outlet port is set in a fully opened state even when the refrigerant flowing passage is switched to either of the first refrigerant flowing passage and the second refrigerant flowing passage. a base which is provided with a refrigerant inlet port, a refrigerant outlet port and a valve seat face on which at least one of the refrigerant inlet port and the refrigerant outlet port is opened; a cover configured to section a valve chamber communicating with the refrigerant inlet port and the refrigerant outlet port between the base and the cover; a valve body which is turnably disposed in an inside of the valve chamber provided with a contact face sliding on the valve seat face; and a valve body drive mechanism structured to turn the valve body around an axial line which is perpendicular to the valve seat face; wherein the valve body drive mechanism turns the valve body and thereby a refrigerant flowing passage from the refrigerant inlet port to the refrigerant outlet port through the valve chamber is switched at least to a first refrigerant flowing passage and to a second refrigerant flowing passage; and wherein a refrigerant flowing amount flowing through the first refrigerant flowing passage is smaller than a refrigerant flowing amount flowing through the second refrigerant flowing passage; characterized in that: the valve body is turnably disposed at a position as a turning center shifted to a side of one port of the refrigerant inlet port and the refrigerant outlet port; the valve body drive mechanism comprises a drive source and a gear train with an output gear which transmits a drive force of the drive source to the valve body, such that when the valve body is integrally turned together with the output gear, the refrigerant flowing passage between the valve chamber and the one port of the refrigerant inlet port and the refrigerant outlet port is switched to the first refrigerant flowing passage and to the second refrigerant flowing passage, and the other port of the refrigerant inlet port and the refrigerant outlet port is set in a fully opened state even when the refrigerant flowing passage is switched to either of the first refrigerant flowing passage and the second refrigerant flowing passage. the valve body is turnably disposed at a position as a turning center shifted to a side of one port of the refrigerant inlet port and the refrigerant outlet port; the valve body drive mechanism comprises a drive source and a gear train with an output gear which transmits a drive force of the drive source to the valve body, such that when the valve body is integrally turned together with the output gear, the refrigerant flowing passage between the valve chamber and the one port of the refrigerant inlet port and the refrigerant outlet port is switched to the first refrigerant flowing passage and to the second refrigerant flowing passage, and the other port of the refrigerant inlet port and the refrigerant outlet port is set in a fully opened state even when the refrigerant flowing passage is switched to either of the first refrigerant flowing passage and the second refrigerant flowing passage.