A dental curable composition comprising: a polymerizable monomer, an organic amine-based polymerization initiator, and a soft resin material being not dissolved by the component and having a durometer A hardness, measured by a type A durometer based on JIS K6253, of not more than 90 and median particle diameter of 0.01 to 500 μm, the soft resin material being at least one selected from the group consisting of gutta-percha, polyethylene, polypropylene, ethylene propylene copolymer, ethylene propylene terpolymer, silicone polymer, polyisoprene, ethylene vinyl acetate copolymer and acrylic acid ester copolymer, wherein the component contains - (A') a long-chain polymerizable monomer having a chain length of 19 or more atoms and containing a polyalkylene glycol di(meth)acrylate having at least 4 oxyalkylene recurring units (-(-(-CH 2 -) p -O-) n -), wherein p is an integer of 2 or more, and n is an integer of 4 or more, in the molecule and - a polymerizable monomer having an acidic group in the molecule, the composition contains water alone or a mixed solvent of water and an organic solvent miscible with water, which is a solvent miscible with the long-chain polymerizable monomer, and when the amount (parts by weight) based on 100 parts by weight of the component of the component (A') is represented by [a'] and the amounts (parts by weight) based on 100 parts by weight of the total of the components and of the components, and are represented by (a), (b) and (c), respectively, 70 ≦ a ≦ 99.99, 0.01 ≦ b ≦ 30, 1 ≦ a ′ / 5 + c, 0 ≦ a ′ ≦ 95, and 0 < c ≦ 250. a polymerizable monomer, an organic amine-based polymerization initiator, and a soft resin material being not dissolved by the component and having a durometer A hardness, measured by a type A durometer based on JIS K6253, of not more than 90 and median particle diameter of 0.01 to 500 μm, the soft resin material being at least one selected from the group consisting of gutta-percha, polyethylene, polypropylene, ethylene propylene copolymer, ethylene propylene terpolymer, silicone polymer, polyisoprene, ethylene vinyl acetate copolymer and acrylic acid ester copolymer, wherein the component contains - (A') a long-chain polymerizable monomer having a chain length of 19 or more atoms and containing a polyalkylene glycol di(meth)acrylate having at least 4 oxyalkylene recurring units (-(-(-CH 2 -) p -O-) n -), wherein p is an integer of 2 or more, and n is an integer of 4 or more, in the molecule and - a polymerizable monomer having an acidic group in the molecule, the composition contains water alone or a mixed solvent of water and an organic solvent miscible with water, which is a solvent miscible with the long-chain polymerizable monomer, and when the amount (parts by weight) based on 100 parts by weight of the component of the component (A') is represented by [a'] and the amounts (parts by weight) based on 100 parts by weight of the total of the components and of the components, and are represented by (a), (b) and (c), respectively, 70 ≦ a ≦ 99.99, 0.01 ≦ b ≦ 30, 1 ≦ a ′ / 5 + c, 0 ≦ a ′ ≦ 95, and 0 < c ≦ 250. - (A') a long-chain polymerizable monomer having a chain length of 19 or more atoms and containing a polyalkylene glycol di(meth)acrylate having at least 4 oxyalkylene recurring units (-(-(-CH 2 -) p -O-) n -), wherein p is an integer of 2 or more, and n is an integer of 4 or more, in the molecule and - a polymerizable monomer having an acidic group in the molecule, the composition contains water alone or a mixed solvent of water and an organic solvent miscible with water, which is a solvent miscible with the long-chain polymerizable monomer, and when the amount (parts by weight) based on 100 parts by weight of the component of the component (A') is represented by [a'] and the amounts (parts by weight) based on 100 parts by weight of the total of the components and of the components, and are represented by (a), (b) and (c), respectively, 70 ≦ a ≦ 99.99, 0.01 ≦ b ≦ 30, 1 ≦ a ′ / 5 + c, 0 ≦ a ′ ≦ 95, and 0 < c ≦ 250. the amount (parts by weight) based on 100 parts by weight of the component of the component (A') is represented by [a'] and the amounts (parts by weight) based on 100 parts by weight of the total of the components and of the components, and are represented by (a), (b) and (c), respectively, 70 ≦ a ≦ 99.99, 0.01 ≦ b ≦ 30, 1 ≦ a ′ / 5 + c, 0 ≦ a ′ ≦ 95, and 0 < c ≦ 250.