A sensor unit is for attaching to a vibrating body. The sensor unit includes: a sheet sensor that has a sheet shape and flexibility. The sheet sensor converts vibration that acts in a thickness direction of the sheet sensor to a voltage and outputting the voltage. The sensor unit further includes a first sticking member that includes a soft base material and two adhesive layers. The soft base material has a sheet shape and stress conformability. The two adhesive layers are respectively provided on both surfaces of the soft base material. The first sticking member is attached to one surface of the sheet sensor.