Pressure detection device

A pressure detection device comprising:

• a pressure detection unit configured to determine a pressure transferred to a pressure detection part;
• a flow path unit having a flow path formed in the flow path unit, a fluid being allowed to flow through the flow path;
• and
• an attaching mechanism configured to detachably attach the flow path unit to the pressure detection unit,
• wherein the pressure detection unit includes
• a pressure sensor having the pressure detection part, and
• a first connecting part joined to the pressure detection part,
• wherein the flow path unit includes
• a resin pressure receiving part configured to displace in response to receiving a pressure of a fluid flowing through the flow path, and
• a second connecting part joined to the pressure receiving part,
• wherein either one of the first connecting part and the second connecting part includes a magnet, and the other of the first connecting part and the second connecting part includes a magnet or a magnetic material,
• wherein in a state where the flow path unit is attached to the pressure detection unit by the attaching mechanism, the first connecting part and the second connecting part are arranged attracted to each other by magnetic force,
• wherein the pressure receiving part is formed circularly in planar view and formed in a plate shape from the center position to an end of the pressure receiving part,
• wherein the second connecting part includes a resin joining member formed cylindrically extending along the axis and having a first joining face and a second joining face formed at both ends in a direction along the axis, the first joining face being joined to the pressure receiving part, and the second joining face being joined to the magnet or the magnetic material, and
• wherein the first joining face of the joining member and the pressure receiving part are joined to each other by an adhesive agent in a predetermined range surrounding the center position, and the second joining face of the joining member and the magnet or the magnetic material are joined to each other by an adhesive agent.