Curable composition

A curable composition which comprises

• (a) a perfluoro(poly)ether group-containing silane compound represented by the following general formula (I):
• wherein,
• R3s each independently represent a hydrogen atom or a monovalent organic group at each appearance,
• R4s each independently represent a hydroxyl group or a hydrolyzable group(s) at each appearance,
• R5s each independently represent a divalent alkylene group at each appearance,
• R6s each independently represent a divalent organic group at each appearance,
• R7s are all hydrogen atoms,
• PFPE1s each independently represent a divalent perfluoro(poly)ether group represented by the formula:
• wherein, f is an integer of 1 or more and 10 or less, a1, a2, a3, a4, a5, a6, a7 and a8 are each independently an integer of 0 or more and 200 or less, a sum of a1, a2, a3, a4, a5, a6, a7 and a8 is an integer of 5 or more and 200 or less, and the unit represented by (CfF2f) is located at the left end of the group, the order of existence of each repeating unit enclosed in parentheses with the subscript a1, a2, a3, a4, a5, a6, a7 or a8 is arbitrary in the formula, X10s are each independently a hydrogen atom, a fluorine atom or a chlorine atom at each appearance, provided that when all X10s are hydrogen atoms or chlorine atoms, at least one of a1, a2, a4, a5, a6, a7 and a8 is an integer of 1 or more at each appearance,
• j is 1,
• p and q are each 0 or 1, and
• r is an integer of 1 or more;
• (b) an organic silicon compound having at least two OR2 groups, where, R2s are each independently a hydrogen atom or a monovalent organic group at each appearance, bonded to an Si atom, provided that, the (a) PFPE-containing silane compound is excluded, or a partially hydrolyzed condensate thereof;
• and
• (c) a condensation catalyst.