An optical pickup device includes a photodetector which receives laser light reflected on a recording medium, and an optical system which guides laser light to the photodetector as convergent light. The dispenser sprays antimicrobial solution toward moving raw food products. Holes in the lateral flaps are aligned so as to receive inflator mounting fasteners of the retaining structure, and so as to form the duct. The improvement in-plane tendency Za is calculated using the following expression.