Abstract: A sensor unit has sensors for measuring the components of a culture medium in a culture vessel, and comprises a plurality of sensors and a linking portion. The plurality of sensors each have a main body and a sensing unit disposed on the lower end side of the main body and immersed in the culture medium to measure the components of the culture medium. The linking portion links the plurality of sensors on the upper end side of the main body.

Abstract: A puncturing instrument includes a cylindrical main body case having a puncture aperture on a lower end side; a needle holder provided on a puncture aperture side inside the cylindrical main body case; a first elastic object for moving the needle holder to the puncture aperture side; and a second elastic object for pulling the needle holder back to an upper end side inside the cylindrical main body case, from a state in which the needle holder is moved to the puncture aperture side by the first elastic object. A rotator rotates around a rotation shaft fixed to the cylindrical main body case, and is coupled with a coupling portion of the needle holder on a first one of two sides of the rotator with the rotation shaft interposed therebetween and is coupled with the second elastic object on a second one of the two sides of the rotator.

Abstract: The invention comprises: a cylindrical main body case (1) having a puncture aperture (5) on the lower end side; a needle holder (9) provided on the puncture aperture (5) side inside the main body case (1); an elastic object (15) for moving the needle holder (9) to the puncture aperture (5) side; and an elastic object (25) for pulling the needle holder (9), moved to the puncture aperture (5) side by the elastic object (15), back to the upper end side inside the main body case (1), where a rotator (20) which rotates around a rotation shaft (21) fixed to the main body case (1), and where the rotator (20) is coupled with a coupling portion (14) of the needle holder (9) on one of both sides of the rotator (20) with the rotation shaft (21) interposed therebetween and is coupled with the elastic object (25) on the other side.