To provide a slide curtain coating apparatus and method for depositing a curtain of coating liquid onto a running web, the apparatus and method capable of preventing the curtain from being condensed at its center region and preventing the resulting coating from having greater thickness at its edge regions. The coating apparatus includes: a slit for discharging the coating liquid; a slide on which the curtain flows down; and, a slide edge guide along which the curtain flows and which is provided at both edges on the slide and each having auxiliary liquid supply means at the surface facing the curtain; and auxiliary liquid supply means for discharging the auxiliary liquid from all over the surface thereof which touches the curtain at the edge guide. The coating method includes discharging the auxiliary liquid from all over the surface of the auxiliary supply means coating apparatus.