A valve device comprising: a valve body that has a valve chamber; tubular flow channels (11, 12, 13) that are in communication with the valve chamber and that are connected to the valve body; and a valve member that is installed in the valve chamber and that switches between connections of the flow channels (11, 12, 13), wherein at least one flow channel of the flow channels (11, 12, 13) includes a first portion that is connected to the valve body and that is linear, a second portion that is connected at an angle to the first portion and that is linear, a lid member that is joined such that the lid member covers an opening of a tip end (11a1) of the first portion, and a pair of projecting portions that is disposed such that the projecting portions interpose the first portion therebetween in a radial direction and face each other, wherein the pair of projecting portions extends in an axial direction of the second portion from an outer circumferential surface of the first portion to an outer circumferential surface of the second portion, characterized in that the pair of the projecting portions extends across the outer circumferential surface of the first portion and the outer circumferential surface of the second portion, the valve device further comprising a connecting portion that extends in a circumferential direction on the outer circumferential surface of the first portion such that the connecting portion couples the pair of projecting portions with each other, so as to form a substantially U-shape when viewed in the axial direction of the first portion, the pair of projecting portions and the connecting portion include a planar surface portion that faces the valve body direction, which is the opposite direction from the tip end (11a1) of the first portion. wherein at least one flow channel of the flow channels (11, 12, 13) includes a first portion that is connected to the valve body and that is linear, a second portion that is connected at an angle to the first portion and that is linear, a lid member that is joined such that the lid member covers an opening of a tip end (11a1) of the first portion, and a pair of projecting portions that is disposed such that the projecting portions interpose the first portion therebetween in a radial direction and face each other, wherein the pair of projecting portions extends in an axial direction of the second portion from an outer circumferential surface of the first portion to an outer circumferential surface of the second portion, characterized in that the pair of the projecting portions extends across the outer circumferential surface of the first portion and the outer circumferential surface of the second portion, the valve device further comprising a connecting portion that extends in a circumferential direction on the outer circumferential surface of the first portion such that the connecting portion couples the pair of projecting portions with each other, so as to form a substantially U-shape when viewed in the axial direction of the first portion, the pair of projecting portions and the connecting portion include a planar surface portion that faces the valve body direction, which is the opposite direction from the tip end (11a1) of the first portion.