An air conditioner includes a printed circuit board to which a power device is attached; and a refrigerant jacket which is connected to the power device, and through which refrigerant used for a refrigeration cycle flows. The flotation device includes an expansion part arranged to be expanded by compressed air and a guide for supplying compressed air from the compressed air cylinder to the expansion part. The propagation time measurement device includes a correlation computation unit that generates correlation values by performing a correlation computation on each of the continuous waves and a reception signal that is returned from the terminal and received by the base station. The board is integrally formed by wood particles.