A slide guide frame portion of a screen device comprising: a pair of hollow screen mounting frame portions (3,8) configured to be disposed to face each other in which at least one of the portions is capable of sliding; a screen configured to be attached between these screen mounting frame portions to be freely developed; and a slide guide frame portion (12,13) configured to be disposed in the vicinity of either end portion of the screen not on a side where the screen is attached to the screen mounting frame portion, wherein each slide guide frame portion has flexibility, at least one end serves as a free end and is capable of being stored in and drawn out of the slidable screen mounting frame portion, and when the slide guide frame portion is drawn out of the screen mounting frame portion as the slidable screen mounting frame portion slides, a drawn-out portion of the slide guide frame portion has linearity, wherein any one or both of the two slide guide frame portions are formed by a plurality of rigid units, each of which includes a pair of side wall portions disposed to face each other and a bridge portion linking both side wall portions from the substantially center portion to one end portion, in which adjacent two rigid units are rotatably connected to each other, wherein in the side wall portion, a depressed portion which is depressed in a width direction of the rigid unit is formed in an approximately half portion from the substantially center portion to the one end portion, a through hole which is made in the width direction of the rigid unit is formed in the approximately half portion from the substantially center portion to the other end portion, wherein in the depressed portion, a shaft protruding toward the outside is provided in the substantially center portion of the depressed portion, wherein the adjacent two rigid units are connected such that the shaft of one rigid unit is inserted into the through hole of the other rigid unit from the inside, characterized in that: - in the side wall portion, a protrusion is provided adjacent to the through hole inside the substantially center portion; - in the depressed portion, a notch portion which is cut in a height direction of the rigid unit is formed from the substantially center portion of the depressed portion to the one end portion of the side wall portion; and - the one rigid unit is freely rotated with respect to the other rigid unit within a range in which the protrusion abuts on one end and the other end of the notch portion. a pair of hollow screen mounting frame portions (3,8) configured to be disposed to face each other in which at least one of the portions is capable of sliding; a screen configured to be attached between these screen mounting frame portions to be freely developed; and a slide guide frame portion (12,13) configured to be disposed in the vicinity of either end portion of the screen not on a side where the screen is attached to the screen mounting frame portion, wherein each slide guide frame portion has flexibility, at least one end serves as a free end and is capable of being stored in and drawn out of the slidable screen mounting frame portion, and when the slide guide frame portion is drawn out of the screen mounting frame portion as the slidable screen mounting frame portion slides, a drawn-out portion of the slide guide frame portion has linearity, wherein any one or both of the two slide guide frame portions are formed by a plurality of rigid units, each of which includes a pair of side wall portions disposed to face each other and a bridge portion linking both side wall portions from the substantially center portion to one end portion, in which adjacent two rigid units are rotatably connected to each other, wherein in the side wall portion, a depressed portion which is depressed in a width direction of the rigid unit is formed in an approximately half portion from the substantially center portion to the one end portion, a through hole which is made in the width direction of the rigid unit is formed in the approximately half portion from the substantially center portion to the other end portion, wherein in the depressed portion, a shaft protruding toward the outside is provided in the substantially center portion of the depressed portion, wherein the adjacent two rigid units are connected such that the shaft of one rigid unit is inserted into the through hole of the other rigid unit from the inside, characterized in that: - in the side wall portion, a protrusion is provided adjacent to the through hole inside the substantially center portion; - in the depressed portion, a notch portion which is cut in a height direction of the rigid unit is formed from the substantially center portion of the depressed portion to the one end portion of the side wall portion; and - the one rigid unit is freely rotated with respect to the other rigid unit within a range in which the protrusion abuts on one end and the other end of the notch portion. - in the side wall portion, a protrusion is provided adjacent to the through hole inside the substantially center portion; - in the depressed portion, a notch portion which is cut in a height direction of the rigid unit is formed from the substantially center portion of the depressed portion to the one end portion of the side wall portion; and - the one rigid unit is freely rotated with respect to the other rigid unit within a range in which the protrusion abuts on one end and the other end of the notch portion.