A dental adhesive agent, comprising: a polymerizable monomer; a first inorganic particle that has been subjected to a surface treatment with a chemical compound expressed by a general formula, where "R 1 " is a hydrogen atom or a methyl group, "R 2 " is a hydrolyzable group, "R 3 " is a hydrocarbon group whose carbon number is greater than or equal to 1 and less than or equal to 6, "p" is 2 or 3 and "q" is an integer greater than or equal to 6 and less than or equal to 13, having a volume median diameter greater than or equal to 0.1 μm and less than or equal to 0.5 μm; a second inorganic particle that has been subjected to a surface treatment with a chemical compound expressed by a general formula, where "R 1 " is a hydrogen atom or a methyl group, "R 2 " is a hydrolyzable group, "R 3 " is a hydrocarbon group whose carbon number is greater than or equal to 1 and less than or equal to 6, "p" is 2 or 3 and "q" is an integer greater than or equal to 6 and less than or equal to 13, having a volume median diameter greater than or equal to 0.6 μm and less than or equal to 0.9 μm; and a third inorganic particle, having a mean primary-particle diameter greater than or equal to 5 nm and less than or equal to 50 nm, wherein a group expressed by a general formula and / or a group expressed by a general formula is provided at a surface of the third inorganic particle, where each of "R 4 ", "R 5 ", "R 6 ", "R 7 " and "R 8 " is, independently, a methyl group or an ethyl group, wherein the mass ratio of the third inorganic particle with respect to the gross mass of the first inorganic particle, the second inorganic particle and the third inorganic particle is greater than or equal to 0.001 and less than or equal to 0.05, and wherein the mass ratio of the first inorganic particle with respect to the second inorganic particle is greater than or equal to 0.25 and less than or equal to 4, and wherein the volume median diameter and the mean primary-particle diameter are measured as described in the description. a polymerizable monomer; a first inorganic particle that has been subjected to a surface treatment with a chemical compound expressed by a general formula, where "R 1 " is a hydrogen atom or a methyl group, "R 2 " is a hydrolyzable group, "R 3 " is a hydrocarbon group whose carbon number is greater than or equal to 1 and less than or equal to 6, "p" is 2 or 3 and "q" is an integer greater than or equal to 6 and less than or equal to 13, having a volume median diameter greater than or equal to 0.1 μm and less than or equal to 0.5 μm; a second inorganic particle that has been subjected to a surface treatment with a chemical compound expressed by a general formula, where "R 1 " is a hydrogen atom or a methyl group, "R 2 " is a hydrolyzable group, "R 3 " is a hydrocarbon group whose carbon number is greater than or equal to 1 and less than or equal to 6, "p" is 2 or 3 and "q" is an integer greater than or equal to 6 and less than or equal to 13, having a volume median diameter greater than or equal to 0.6 μm and less than or equal to 0.9 μm; and a third inorganic particle, having a mean primary-particle diameter greater than or equal to 5 nm and less than or equal to 50 nm, wherein a group expressed by a general formula and / or a group expressed by a general formula is provided at a surface of the third inorganic particle, where each of "R 4 ", "R 5 ", "R 6 ", "R 7 " and "R 8 " is, independently, a methyl group or an ethyl group, wherein the mass ratio of the third inorganic particle with respect to the gross mass of the first inorganic particle, the second inorganic particle and the third inorganic particle is greater than or equal to 0.001 and less than or equal to 0.05, and wherein the mass ratio of the first inorganic particle with respect to the second inorganic particle is greater than or equal to 0.25 and less than or equal to 4, and where each of "R 4 ", "R 5 ", "R 6 ", "R 7 " and "R 8 " is, independently, a methyl group or an ethyl group, wherein the mass ratio of the third inorganic particle with respect to the gross mass of the first inorganic particle, the second inorganic particle and the third inorganic particle is greater than or equal to 0.001 and less than or equal to 0.05, and wherein the mass ratio of the first inorganic particle with respect to the second inorganic particle is greater than or equal to 0.25 and less than or equal to 4, and wherein the volume median diameter and the mean primary-particle diameter are measured as described in the description.