To prevent an interference between a guide section in a rolling-door shutter case and an engaging pawl under the state in which the engaging pawl is left as it is projected to the interior section of a guide rail.

The guide structure of rolling-door shutter curtains is arranged to a slit 1b being formed to the bottom section 1a of the rolling-door shutter case 1 and having the projected and entered rolling-door shutter curtains 3 and guiding the rolling-door shutter curtains 3 in the rolling-door shutter case 1 to the slit 1b. The guide structure of the rolling-door shutter curtains has curved projecting-surface shaped guide sections 9 placed at the end sections of the slit 1b, connected at the upper ends of the guide rails 4 supporting the edge sections of the rolling-door shutter curtains 3 and guiding the open-close operations of the rolling-door shutter curtains 3 and extended towards the inside of the rolling-door shutter case 1 from sections near to the edges sections of the slit 1b while being expanded in an approximately funnel shape to a slit-width length. The guide sections 9 are separated and disposed from the interior sections 4b of the guide rails 4 while being disposed approximately continuously to the groove sections 4d of the guide rails 4.