PROBLEM TO BE SOLVED: To sterilize seed by hot water, to cool the seed by cold water, and to dry the seed, efficiently.SOLUTION: A hot water sterilizing tank 1, a cooling tank 2 and a drying chamber 3 are successively disposed from an upstream side toward a downstream side, conveying means 5, 6, 7, 41a are disposed to successively and continuously convey the seed put in air-permeable containers 8, 41b from the upstream side toward the downstream side of the hot water sterilizing tank 1, the cooling tank 2 and the drying chamber 3, and hot water sterilizing work, and cold water cooling work and drying work, are continuously performed without replacing the seed.COPYRIGHT: (C)2008,JPO&INPIT【課題】種子の温湯消毒、冷水冷却及び乾燥を能率的に行なう。【解決手段】温湯消毒タンク(1)、冷却タンク(2)及び乾燥室(3)を上手側から下手側に向けて順次配設し、通気性のある容器(8,41b)に入れた種子を温湯消毒タンク(1)、冷却タンク(2)及び乾燥室(3)の上手側から下手側に向けて順次連続的に搬送する搬送手段(5,6,7,41a)を設け、種子を入れ替えせずに温湯消毒作業、冷水冷却作業及び乾燥作業を連続的に行なう。【選択図】図1