Safety cover for mold clamping device

The invention relates to a structure in which a safety door is coupled to a casing via a telescopic structure when a condition where the safety door is mounted on the casing in such a way that the safety door can be opened and closed freely is known. In the telescopic structure, rigidity is reduced due to a front end part has a small diameter. A connection structure capable of improving rigidity is disclosed. A connecting mechanism (40) that connects an upper portion of the safety door (23) to the support frame (21) includes a first rail (41) on the support frame (21), a second rail (42) on the safety door (23), and an intermediate plate (45) arranged between the first rail (41) and the second rail (42). The intermediate plate 45 has one face 45a that supports the first sliders 43 embeddedin the first rail 41 and another face (opposite face) 45b that supports the second sliders 44 embedded in the second rail 42. Due to adoption of the intermediate plate 45, the second rail 42 which isused as a front end part