PURPOSE: To rapidly cure at a room temperature in the presence of moisture by blending a polyurethane polymer having an alkoxy silyl group at the terminal with amino silane and a piperazine-based accelerator.

CONSTITUTION: The one-component moisture-curable composition is provided by blending (A) a silane-terminated polyurethane polymer expressed by formula I {R is a 1-6C alkyl, R1 is a divalent hydrocarbon group, a hydrocarbon ether group or a hydrocarbon amino group, A is S or NR2 (R2 is an H, 1-6C alkyl)}, with (B) amino silane (example: A1110 of Union Carbide) expressed by formula II (R3, R4 are each an alkyl of same or different 1-4C, R5 is a 1-4C alkyl or alkoxy, R6 is H or amino alkyl, X is 1-3), and (C) an accelerator (a piperazine derivative containing a silyl group expressed by formula III) at the ratio of 0.2-1.0 pts.wt. component B, and 0.2-1.0 pts.wt. component C, to 100 pts.wt. component A.