To provide a mattress which does not become stuffy although sweat is not sucked up, can be dried only by shaking even if it is washed, and is antibacterial.

In a membrane-less hydrophobic urethane foam mattress, membrane-less hydrophobic polyurethane foam, which is a hydrophobic polyurethane foam manufactured from at least hydrophobic polyol and polyisocyanate, a foam stabilizer, a catalyst, etc. and in which the cellular membrane of polyurethane foam after foaming is removed by a posttreatment method, is employed.