A pressure controller 1 supplies fluid to a cuff and controls an internal pressure of the cuff. The pressure controller 1 has a housing 10 having a flattened shape. In the housing 10, a pump 31 having a discharge port 33 through which the fluid is discharged and which is directed in a thickness direction of the housing 10, and a control module 20 which controls the pump 31 such that the internal pressure of the cuff falls within a predetermined range, are disposed. A filter 39 which has elasticity and has lower thermal conductivity than the housing 10 is disposed at a side opposite to the discharge port 33 and between the pump 31 and an inner surface of the housing 10.
