The invention relates to a head-up display. Through a simple structure, when external force is imposed on a combiner, the combiner is capable of return to own original position. Second rotatable shafts (12) are arranged in a case main body and a combiner driving unit (3) for configuring the combiner (12) to a blocking opening part position and a standing-up position. Bearings (14) are arranged relative to substrate parts (13) in a way of freely rotating around axes. The bearing (14) supports the second rotatable shafts (12) to freely rotate at the substrate parts (13) on sides of the case main part (1). A first spring (15) used for imposing force on each corresponding bearing in a clockwise direction relative to each corresponding substrate part is installed between the corresponding substrate part (13) and the corresponding bearing (14). A second spring (18) used for imposing force on each combiner driving unit in a counter-clockwise direction relative to each bearing is installed between the corresponding bearing (14) and the corresponding combiner driving unit (3).