Indoor unit and air conditioner

An indoor unit that includes a refrigerant circuit to circulate a refrigerant, and is the indoor unit of an air conditioner, the indoor unit comprising:

• a base;
• a refrigerant sensor unit that is joined from one side in a joining direction to the base;
• and
• a fixer that fixes the refrigerant sensor unit to the base;
• wherein
• the refrigerant sensor unit includes
• a sensor main body that detects the refrigerant that has gasified, and
• a housing that is provided with an accommodation space which accommodates the sensor main body,
• the housing includes
• a housing main body,
• a lid that is joined to the housing main body from the one side in the joining direction, and that surrounds the accommodation space along with the housing main body, and
• a sealing member that is sandwiched between the housing main body and the lid,
• the housing main body includes
• a first sealing surface which faces the one side in the joining direction and contacts the sealing member, and
• a first opposing surface which faces another side in the joining direction, the lid includes
• a second sealing surface which faces the another side in the joining direction and contacts the sealing member, and
• a second opposing surface which faces the one side in the joining direction,
• the base includes a first pressing surface which faces the one side in the joining direction and contacts the first opposing surface,
• the fixer includes
• a second pressing surface which contacts the second opposing surface, and
• a fixing portion which is fixed to the base, and
• the housing is sandwiched between the first pressing surface and the second pressing surface.