Polymerizable dental composition comprising (a) a polymerizable compound of the following formula (I): X'-L-X" (I) wherein X' represents a group of the following formula (II): X" represents a moiety of the following formula (V): wherein the dotted lines represent a double bond; the jagged line(s) indicate(s) that formula (II) and (V) include any (E) or (Z) isomer, Z' and Z*represent >N-R, wherein R is -CH 2 -CH=CH 2 ; R 1 , R 4 , R 5 , and R 7 represent a hydrogen atom; R 2 and R 8 which may be the same or different, independently represents a hydrogen atom or a straight-chain C 1-4 or branched C 3-6 alkyl group, which group may be substituted by a C 1-6 alkoxy group; R 3 represents a straight-chain C 1-4 or branched C 3-6 alkyl group; R 9 represents a hydrogen atom, or a straight-chain C 1-4 or branched C 3-6 alkyl group; and L is a single bond; and (b) a photosensitizer, and (c) a diaryl iodonium salt as a coinitiator, and which composition does not contain N,N'-diallyl-1,4-bisacrylamido- -but-2-en (BAABE). (a) a polymerizable compound of the following formula (I): X'-L-X" (I) wherein X' represents a group of the following formula (II): X" represents a moiety of the following formula (V): wherein the dotted lines represent a double bond; the jagged line(s) indicate(s) that formula (II) and (V) include any (E) or (Z) isomer, Z' and Z*represent >N-R, wherein R is -CH 2 -CH=CH 2 ; R 1 , R 4 , R 5 , and R 7 represent a hydrogen atom; R 2 and R 8 which may be the same or different, independently represents a hydrogen atom or a straight-chain C 1-4 or branched C 3-6 alkyl group, which group may be substituted by a C 1-6 alkoxy group; R 3 represents a straight-chain C 1-4 or branched C 3-6 alkyl group; R 9 represents a hydrogen atom, or a straight-chain C 1-4 or branched C 3-6 alkyl group; and L is a single bond; and X' represents a group of the following formula (II): X" represents a moiety of the following formula (V): wherein the dotted lines represent a double bond; the jagged line(s) indicate(s) that formula (II) and (V) include any (E) or (Z) isomer, Z' and Z*represent >N-R, wherein R is -CH 2 -CH=CH 2 ; R 1 , R 4 , R 5 , and R 7 represent a hydrogen atom; R 2 and R 8 which may be the same or different, independently represents a hydrogen atom or a straight-chain C 1-4 or branched C 3-6 alkyl group, which group may be substituted by a C 1-6 alkoxy group; R 3 represents a straight-chain C 1-4 or branched C 3-6 alkyl group; R 9 represents a hydrogen atom, or a straight-chain C 1-4 or branched C 3-6 alkyl group; and the dotted lines represent a double bond; the jagged line(s) indicate(s) that formula (II) and (V) include any (E) or (Z) isomer, Z' and Z*represent >N-R, wherein R is -CH 2 -CH=CH 2 ; R 1 , R 4 , R 5 , and R 7 represent a hydrogen atom; R 2 and R 8 which may be the same or different, independently represents a hydrogen atom or a straight-chain C 1-4 or branched C 3-6 alkyl group, which group may be substituted by a C 1-6 alkoxy group; R 3 represents a straight-chain C 1-4 or branched C 3-6 alkyl group; R 9 represents a hydrogen atom, or a straight-chain C 1-4 or branched C 3-6 alkyl group; and L is a single bond; and (b) a photosensitizer, and (c) a diaryl iodonium salt as a coinitiator, and <EOS>