The work, visual inspection device 30 composes a conveyance table 2 which holds and conveys works W1 and W2 and camera units 8, 9, 10, 11, 12 and 13 which capture images of the works conveyed by the conveyance table, The camera 91/101 of the camera units 9 and 10 includes a first body tube 91C/101C including an imaging lens 91L/101L and a second body tube 91Ca/101a attached to the front end of the first body tube 91C/101C. The second body tube 91Ca/101Ca includes a glass plate 91G/101G for focal adjustment having two surfaces in parallel with each other.