An endoscope cover fixing device to reliably fix a cover to an endoscope without associated damage. The endoscope cover fixing device includes a fixing device main body and a pair of fixing protrusion portions. The fixing device main body includes a curved portion and insert holes, and is deformable in the direction in which the bend amount increases. The pair of fixing protrusion portions, which have contact surfaces, are provided to protrude from a concave surface side of the fixing device main body and are disposed in two opposing regions of the concave surface. The contact surfaces are disposed in parallel with a fixed distance therebetween. During deformation of the fixing device main body, the pair of fixing protrusion portions move in parallel in opposing directions. As a result, the contact surfaces contact opposing positions on the outer circumferential surface of the endoscope by way of the cover.
