Photochromic curable composition and photochromic optical article

A photochromic curable composition comprising:

• (A) a (meth)acrylate composition comprising a polyfunctional (meth)acrylate having three or more (meth)acryloyl groups within a molecule, in a content of 24 to 100% by mass;
• and
• (B) a photochromic compound comprising naphthopyran being represented by formula (1) below and having a long chain group having a number average molecular weight of 300 to 10000:
• wherein,
• R1 and R2 each independently represent a group bonded to the long chain group having a number average molecular weight of 300 to 10000, a hydroxy group, an alkyl group, a haloalkyl group, a cycloalkyl group optionally having a substituent, an alkoxy group, an amino group, a substituted amino group, a heterocyclic group optionally having a substituent, a cyano group, a halogen atom, an alkylthio group, an arylthio group optionally having a substituent, a nitro group, a formyl group, a hydroxycarbonyl group, an alkylcarbonyl group, an alkoxycarbonyl group, an aralkyl group optionally having a substituent, an aralkoxy group optionally having a substituent, an aryloxy group optionally having a substituent, an aryl group optionally having a substituent, a heteroaryl group optionally having a substituent, a thiol group, an alkoxyalkylthio group, a haloalkylthio group or a cycloalkylthio group optionally having a substituent,
• a represents an integer of 0 to 2 and b represents an integer of 0 to 4,
• when the a is 2, a plurality of R1s may be identical to or different from each other,
• when the a is 2 and adjacent R1s are present, the two adjacent R1s may form, together with carbon atoms to which each R1 is bonded, a ring which may include at least one heteroatom selected from a group consisting of oxygen atom, a sulfur atom, and a nitrogen atom, and the ring may further have a substituent,
• when the b is 2 to 4, a plurality of R2s may be identical to or different from each other,
• when the b is 2 to 4 and adjacent R2s are present, the two adjacent R2s may form, together with carbon atoms to which each R2 is bonded, a ring which may include at least one heteroatom selected from a group consisting of an oxygen atom, a sulfur atom, and a nitrogen atom, and the ring may further have a substituent,
• when neither the a nor the b is 0, at least one R1 and at least one R2 may form a ring, and the ring may further have a substituent,
• R3 and R4 each independently represent a group bonded to the long chain group having a number average molecular weight of 300 to 10000, an aryl group optionally having a substituent or a heteroaryl group optionally having a substituent, and
• at least one selected from R1, R2, R3 and R4 is a group bonded to the long chain group having a number average molecular weight of 300 to 10000.