A flat-blade type wiper apparatus includes: a wiper lip; a spoiler-integrated lever that prevents the wiper lip from floating on the windshield of a vehicle; a vertebra that elastically supports the wiper lip; and an end cap that prevents the wiper lip from slipping in a direction of a length of the vertebra, wherein a cap fixing hole is disposed at one end of the vertebra and passes through an upper surface and a lower surface of the vertebra; a first stopper protrudes from a ceiling surface of the end cap in a downward direction and couples to the cap fixing hole; and a second stopper protrudes from a sidewall of the end cap toward the wiper lip, and prevents the wiper lip from slipping by being accommodated in a coupling groove that is formed in the wiper lip.