A head-mounted image display apparatus which uses two or more image display devices, and which is compact and lightweight and yet enables observation of a clear image over the entire observation image field at a wide field angle and high resolution. The image display apparatus includes two image display devices (5 and 6) and two ocular optical systems (3 and 4) for projecting, respectively, images formed by the two image display devices (5 and 6) as enlarged virtual images in front of one common eyeball (7) of an observer and for leading the projected images to the eyeball (7). When the two ocular optical systems are defined as a first ocular optical system (3) and a second ocular optical system (4) in order from the observer side, the first and second ocular optical systems (3 and 4) have concave mirrors (12 and 22), respectively. These reflecting surfaces are tilted or decentered with respect to an observer's visual axis (2). The concave mirror 12 of the first ocular optical system (3) is a semitransparent surface. The first ocular optical system (3) is disposed on the eyeball side of the second ocular optical system (4) in the direction of the observer's visual axis (2), and the second ocular optical system (4) is disposed on the side of the first ocular optical system (3) which is remote from the eyeball (7) in the observer's visual axis direction.