The present invention provides an open-cell porous body and a water-absorbing material that can be preferably used as a pedestal for flower arrangement and a culture medium for plants. SOLUTION: An open-celled porous body made of a resin composition containing a polylactic acid resin as a main component, and pulverized pieces of powder obtained by pulverizing a foam of the resin composition are bonded to each other. The pore walls formed form an open-cell structure of the porous body, the apparent density is 0.01 g / cm 3 or more and 0.2 g / cm 3 or less, and the 10% compression stress is 0.02 MPa or more and 0.3 MPa. Hereinafter, an open-cell porous body having a compression recovery rate of 95% or less, and a water-absorbing material comprising the porous body. [Selection] Figure 1【課題】フラワーアレンジメント用台座や植物の培地として好ましく使用することができる連続気泡多孔質体及び吸水材料を提供する。【解決手段】ポリ乳酸系樹脂を主成分とする樹脂組成物からなる連続気泡多孔質体であって、前記樹脂組成物の発泡体を粉砕してなる粉体の粉砕片が相互に接合してなる細孔壁が、前記多孔質体の連続気泡構造を形成しており、見かけ密度が０．０１ｇ／ｃｍ3以上０．２ｇ／ｃｍ3以下、かつ、１０％圧縮応力が０．０２ＭＰａ以上０．３ＭＰａ以下、圧縮回復率が９５％以下である連続気泡多孔質体、該多孔質体からなる吸水材料。【選択図】図１
