Abstract: A notebook computer includes a base; a top cover pivotally coupled via a first rotary shaft to the base and including a display panel disposed at an inner side thereof; a first plate member provided on an outer side of the top cover, a third plate member pivotally coupled at an end to the base via a second rotary shaft; and a second plate member pivotally coupled at an end to the first plate member and slidably coupled at an opposing end to the third plate member, such that the second and the third plate member are displaceable relative to each other. When the top cover is pivotally turned to an operation position, the second end of the second plate member is pushed against the third plate member to restrict the top cover and the third plate member from turning further, and hold the top cover to the operation position.