A capsule type curing agent which comprises a core containing an amine type curing agent (A) and a capsule and a membrane covering said core, wherein said capsule membrane has a bonding group (x) absorbing infrared ray of a wave-number of 1630 to 1680 cm.sup.-1 and/or a bonding group (y) absorbing infrared ray of a wave-number of 1680 to 1725 cm.sup.-1, and contains cured material of an epoxy resin by the amine type curing agent (A) as a curing agent, and weight ratio of the core and the capsule membrane is 100:1 to 100:100.