A cavity is provided between a supply port which supplies the liquid which is received in the liquid reception unit to the outside and the liquid reception unit, with a variable portion which is deformed between the supply port and the liquid reception unit. The variable portion is urged using an urging member from the inside of the cavity through a pressure reception member. In addition, a change in a position of the pressure reception member can be detected using a detection unit. Further, a notch is provided at a surface where the pressure reception member comes into close contact with the urging member, in which the notch extends to the outside from the inside of the contact surface.