Joint unit

A joint unit, comprising:

• a first joint member having a first flow path formed through the first joint member and a screw portion provided at a part on an outer side than the first flow path;
• a second joint member having a second flow path and screwed with the first joint member;
• and
• a gasket arranged between the first joint member and the second joint member and having an opening that allows the first and second flow paths to communicate with each other,
• the second joint member including:
• a second pipe portion having the second flow path therein;
• and
• a second fastener having a tubular shape and arranged on an outer side of the second pipe portion,
• the second fastener including:
• a second fastener body having an external thread portion engaged with the screw portion of the first joint member;
• and
• a second collar having an annular shape and positioned closer to the first joint member than an end of the second fastener body positioned away from the first joint member,
• the second collar including an inner circumferential portion having a contact portion in contact with an outer surface of the second pipe portion and another contact portion in contact with the second fastener body in an extending direction of the second pipe portion,
• the second fastener body and the first joint member being fastened so that the second collar presses the second pipe portion toward the gasket,
• at least one of the first joint member and the second joint member including a connection path formed of a through hole that connects a space between the second fastener and the first joint member to outside, the connection path being continuously open for checking fluid leaked from the first flow path or the second flow path, and
• the gasket contacting at least one of the first joint member and the second joint member at at least one part of an outer periphery of the gasket,
• the connection path being offset from the gasket in a direction of the first flow path and the second flow path, the first flow path and the second flow path can be used to define a longitudinal direction of the joint unit.