PROBLEM TO BE SOLVED: To provide a denture base material having excellent hardness (flexural modulus) and when made into a denture base having excellent durability (yield point strength of compression test).SOLUTION: The denture base material comprises a polymer component including an acrylic resin which has, when made into a test piece with a length of 80 mm, a width of 10 mm, and a thickness of 4 mm, a flexural strength of 110 MPa or more as measured by a three point flexure test under the conditions of a test speed of 2 mm/min, and a fulcrum distance of 64 mm conforming to JIS K7171 (2008), and when made into a notched test piece with a length of 39 mm, a height of 8 mm, and a width of 4 mm, has a maximum stress intensity factor of 1.9 MPa mor more as measured in a fracture toughness test in a flexure test under the conditions of a test speed of 1 mm/minute conforming to JIS T6501 (2012), and the total destruction work is 900 J/m.SELECTED DRAWING: None【課題】硬さ（曲げ弾性率）に優れ、かつ義歯床としたときの耐久性（圧縮試験の降伏点強度）に優れた義歯床用材料を提供する。【解決手段】アクリル系樹脂を含む高分子成分を含有し、長さ８０ｍｍ、幅１０ｍｍ、厚さ４ｍｍの試験片としたときに、ＪＩＳ Ｋ７１７１（２００８）に準拠する、試験速度２ｍｍ／分、支点間距離６４ｍｍの条件の３点曲げ試験によって測定される曲げ強さが１１０ＭＰａ以上であり、かつ、長さ３９ｍｍ、高さ８ｍｍ、幅４ｍｍのノッチ入り試験片としたときに、ＪＩＳ Ｔ６５０１（２０１２）に準拠する、試験速度１ｍｍ／分の条件の曲げ試験による破壊靱性試験によって測定される最大応力拡大係数が１．９ＭＰａ・ｍ１／２以上であり、かつ、全破壊仕事が９００Ｊ／ｍ２以上である義歯床用材料。【選択図】なし
