Abstract: The intermediate support device is used for supporting an intermediate portion of elongated element such as a lifeline. The intermediate support device comprises a frame which is to be fixedly attached to an external structure, and a wheel comprising a hub rotatably carried by the frame and a number of peripherally spaced-apart spokes fixedly attached to and radially extending from the hub, the spokes defining a common first channel side and a common second side opposite the channel side. The frame comprises a frame guard in facing spaced register relative to the spokes first channel side and having an edge portion adjacent the spokes whereby the wheel and the frame guard form a substantially closed loop defining a channel therethrough on the spokes first channel side, for allowing the elongated element to extend through the channel.