Abstract: A secure device, which provides an elastic metal bar made main body, includes a press part, two force exerting parts and two holding parts. The press part is disposed at the middle of the main body for pressing a heat sink. Each of the force exerting parts is aslope extending from an end of the press part respectively with a large flat portion for force exertion. Each of the holding part extends from the force exerting part respectively with a hook end to correspond to and engage with a component on a heat source. Hence, the heat sink is capable of contacting the heat source tightly and the press part is capable of being operated conveniently.