The subject of the invention is a lamellar roller blind. Such solutions are used in the industrial sector as a filling and as protection of openings in buildings, wherein the roller blind is usually installed on the outside of a window.A lamellar roller blind (1) with profile-shaped rotary lamellae (2), whererin the lamellae are connected with a rotation transmission mechanism at a point comprising an axis (3) of rotation of the lamellae, where the lamella socket (26) is located, whilst the rotation transmission mechanism elements are hidden behind a panel-type frame (6) comprising a guide housing (7), wherein a transmission batten (9) is one of the elements of the transmission mechanism, and wherein folded roller blind lamellae are fully hidden inside a box (10) located above the cover area and sides of the box comprise an extension of the panel-type frame with a guide (8), and an independent rolling drive is installed inside the box and connected to two rollers (13) for main side strings (14) connected to the bottom lamella (15) installed in the panel-type frame, wherein each of the main side strings is formed into a loop placed on its own bottom spool (16) and attached at a point, respectively, to the left bottom protrusion (17') and the right bottom protrusion (18') of the bottom lamella without being connected to the other lamellae, and each of the other lamellae is provided, respectively, with a left side handle (17) and a right side handle (18), tiltably connected to a semi-roller (19) comprising the rotation axis of the lamella, permanently fixed to the lamella, wherein the side handles are provided with a top socket (20') and with a bottom socket (20"), where bosses (21) of the distancing side strings (22) connecting neighbouring lamellae are installed, while the semi-roller passing through openings (23) of the side handle of its own lamella is also passing through the flat wedge pad (24), either inside the aperture (25) of the socket (26) rotating within the panel-type frame, or without using the socket (26), directly inside the guide, depending on whether the lamella is in its rotation or sliding position, wherein the aperture (25) of the socket running along the panel-type frame along its entire length comprises a part of the guide, whilst the rotary socket (26) is centrally fixed to a sprocket (27) assigned to the lamella on the inside of the panel-type frame, where the wedge is precisely matching the length and the width of the aperture, and sprockets of the lamella together with the transmission batten provided with edge teeth (4) comprise a single rack and pinion type gear intended to simultaneously rotate multiple sockets (26), and the distance L between openings (23) of neighbouring side handles of the neighbouring lamella with tensioned distancing side strings (22) is equal to the distance between neighbouring sockets located within the panel-type frame, wherein the distancing side strings (22) attached to top sockets (20') of the top lamella (2) are only anchored within the box (10).