A screen device comprising: - a screen to be opened and closed sideward; - a roller pipe to which one of left and right ends of the screen is attached, the roller pipe being configured to be rotated by a resilient force of an integrated coil spring and wind the screen on an outer periphery thereof; - a screen mounting frame being slidable in the direction of opening and closing of the screen with respect to the roller pipe fixed to a predetermined position, to which one end of the screen positioned on the opposite side from the end attached to the roller pipe is attached; and - an upper slide guide frame portion disposed in the vicinity of an upper end of the screen and a lower slide guide frame portion disposed in the vicinity of a lower end of the screen; the upper slide guide frame portion being made up of a plurality of first rigid units each having a pair of side wall portions arranged so as to face each other and a bridging portion connecting both the side wall portions, said first rigid units being coupled to each other so as to be rotatable between two adjacent units, the lower slide guide frame portion being made up of a plurality of second rigid units each having a pair of side wall portions arranged so as to face each other and a bridging portion connecting the both side wall portions, said second rigid units being coupled to each other so as to be rotatable between two adjacent units, the upper slide guide frame portion and the lower slide guide frame portion both having flexibility and each having a free end at one end thereof, the free end being able to be retracted into and withdrawn from the interior of the screen mounting frame and, in contrast, when having been withdrawn from the screen mounting frame in association with the sliding movement of the screen mounting frame, the portion withdrawn from the screen mounting frame keeping their linearity, characterized in that: - the roller pipe includes a revolving shaft on which the integrated coil spring is wound, connected to a rotator rotatably disposed with respect to a stator connected to a lower end of the revolving shaft, and is rotatably retracted in a housing frame; - the stator includes a plurality of radially arranged claws; - holding portions arranged radially corresponding to the claws of the stator are disposed on a lower surface portion of a cap member which is detachably disposed at a lower end of the housing frame, the holding portions each having a holding space for receiving a claw in the interior thereof, the holding space being opened outward at one end on the side of receiving the claw and closed at the other end. - a screen to be opened and closed sideward; - a roller pipe to which one of left and right ends of the screen is attached, the roller pipe being configured to be rotated by a resilient force of an integrated coil spring and wind the screen on an outer periphery thereof; - a screen mounting frame being slidable in the direction of opening and closing of the screen with respect to the roller pipe fixed to a predetermined position, to which one end of the screen positioned on the opposite side from the end attached to the roller pipe is attached; and - an upper slide guide frame portion disposed in the vicinity of an upper end of the screen and a lower slide guide frame portion disposed in the vicinity of a lower end of the screen; - the roller pipe includes a revolving shaft on which the integrated coil spring is wound, connected to a rotator rotatably disposed with respect to a stator connected to a lower end of the revolving shaft, and is rotatably retracted in a housing frame; - the stator includes a plurality of radially arranged claws; - holding portions arranged radially corresponding to the claws of the stator are disposed on a lower surface portion of a cap member which is detachably disposed at a lower end of the housing frame, the holding portions each having a holding space for receiving a claw in the interior thereof, the holding space being opened outward at one end on the side of receiving the claw and closed at the other end.