To provide a pressure sensor unit which can prevent adverse influences of noises on a pressure sensor and an amplifier.

A pressure sensor 7 supported at a supporting body 1, an amplifier 2 set on a substrate 9 and amplifying output signals from the pressure sensor 7, and a shield case 3 storing the amplifier 2 and pressure sensor 7 are provided. A conductor 14 which mounts the shield case 3 to the supporting body 1, mounts the substrate 9 to the shield case 3, and connects the amplifier 2 with an external apparatus penetrates a noise filter 17 set at the shield case 3. Noises transmitted through the conductor 14 run from the noise filter 17 to the shield case 3. Even when noises result from a discharge in the periphery of the shield case 3, the noises are shielded by the shield case 3.