The present invention relates to an eco-friendly architectural window in which a window is installed to open and close a window of a building. The present invention relates to an eco-friendly architectural window including a window frame and an opening and closing window that slides along a rail installed on the window frame. The opening/closing window is a window glass through which light is transmitted for light, a window frame in which the window glass is installed, a shelf groove formed around a part of the side of the window frame, and is accommodated in the shelf groove and rotates in the shelf groove for the window frame. A shelf protruding horizontally or accommodated in the shelf groove, a bra installed under the window frame to fix the sliding movement of the window frame in the rail while the shelf is rotated to protrude horizontally from the window frame A king mechanism, and an interlocking wire connecting the lathe and the braking mechanism so that the braking mechanism interlocks with each other according to the rotation of the lathe, wherein the braking mechanism includes one end of the interlocking wire A braking bar that is connected to the interlocking wire and moves a lever according to the pull and rotation of the interlocking wire, and is attached to the bottom of the other end of the braking bar to contact the rail according to the rotation of the braking bar to fix the sliding movement of the opening and closing window. A braking pad, and a braking return spring supporting the braking bar by an elastic force so as to rotate the braking bar to an initial position when the pulling force of the interlocking wire is released. Therefore, it is possible to increase the utilization of space.
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