A health device flow path formation member (500) includes a flow path (604) configured to supply fluid to a target supply member, a first opening portion (601) located at a first end of the flow path, a second opening portion (602) located at a second end of the flow path, a connection path (603), a plate-like member (610) including the connection path (603), and a joining layer (620) including the first opening portion (601), the joining layer (620) joining the plate-like member (610) to a first target attachment member (32) with the first opening portion (601) communicating with a fluid path (32a) of the first target attachment member (32). When viewed in a first direction in which the joining layer (620) and the plate-like member (610) overlap, the first opening portion (610) is disposed inward a distance from a profile line of a projection of the connection path (603) in the first direction, forming a first protrusion portion in the joining layer (620) that protrudes inward from the profile line.
