A valve device comprising: a valve main body having a valve chamber in which a valve body is arranged, an inflow outlet (44D, 44E) and a communication hole (45D, 45E) communicating the valve chamber and the inflow outlet (44D, 44E); and a rectification member arranged in the communication hole, wherein: the communication hole (45D, 45E) has a bent portion (46c, 46d) in which a center line of the communication hole (45D, 45E) is bent, the rectification member is arranged in the bent portion (46c, 46d) and has a corner portion formed by an inner circumferential surface bent or curved at an angle larger than an angle of the bent portion (46c, 46d), at least two bent portions (46c, 46d) are provided, the two bent portions (46c, 46d) are continuously arranged, and the rectification member is arranged across the two bent portions (46c, 46d), characterized in that the valve main body has a recess, the rectification member has a fitting portion, and the valve device further comprises a whirl-stop member to be fitted to the fitting portion and inserted into the recess, wherein the whirl-stop member is a member that fixes the rectification member to prevent the rectification member from rotating. a valve main body having a valve chamber in which a valve body is arranged, an inflow outlet (44D, 44E) and a communication hole (45D, 45E) communicating the valve chamber and the inflow outlet (44D, 44E); and a rectification member arranged in the communication hole, wherein: the communication hole (45D, 45E) has a bent portion (46c, 46d) in which a center line of the communication hole (45D, 45E) is bent, the rectification member is arranged in the bent portion (46c, 46d) and has a corner portion formed by an inner circumferential surface bent or curved at an angle larger than an angle of the bent portion (46c, 46d), at least two bent portions (46c, 46d) are provided, the two bent portions (46c, 46d) are continuously arranged, and the rectification member is arranged across the two bent portions (46c, 46d), characterized in that the valve main body has a recess, the rectification member has a fitting portion, and the valve device further comprises a whirl-stop member to be fitted to the fitting portion and inserted into the recess, wherein the whirl-stop member is a member that fixes the rectification member to prevent the rectification member from rotating. the communication hole (45D, 45E) has a bent portion (46c, 46d) in which a center line of the communication hole (45D, 45E) is bent, the rectification member is arranged in the bent portion (46c, 46d) and has a corner portion formed by an inner circumferential surface bent or curved at an angle larger than an angle of the bent portion (46c, 46d), at least two bent portions (46c, 46d) are provided, the two bent portions (46c, 46d) are continuously arranged, and the rectification member is arranged across the two bent portions (46c, 46d), characterized in that the valve main body has a recess, the rectification member has a fitting portion, and the valve device further comprises a whirl-stop member to be fitted to the fitting portion and inserted into the recess, wherein the whirl-stop member is a member that fixes the rectification member to prevent the rectification member from rotating.