An optical coherence tomographic apparatus adapted to obtain a tomographic image of a fundus of an eye to be examined based on light obtained by combining return light from the eye irradiated with measurement light through a first lens (101-1) and reference light corresponding to the measurement light, the apparatus comprising: scanning means (122-1, 122-2) provided on an optical path (L1) of the measurement light configured to scan the measurement light on the fundus; a second lens (101-3) disposed between said scanning means (122-1, 122-2) and the first lens (101-1) on the optical path (L1) of the measurement light; first optical path branching means disposed between the first lens (101-1) and said second lens (101-3) configured to make the optical path of the measurement light branch off to a fundus observation optical path (L2) for observation of the fundus ; observation scanning means (117-1, 117-2) configured to scan observation light emitted from an observation light source on the fundus; and a third lens (101-2) disposed between said observation scanning means (117-1, 117-2) and the first optical path branching means on the fundus observation optical path (L2), characterized in that said first lens (101-1), said second lens (101-3), and said scanning means (122-1, 122-2) are disposed so as to make light parallel on the optical path (L1) of the measurement light between said first lens (101-1) and said second lens (101-3), and to make an incident angle of the measurement light scanned by said scanning means (122-1, 122-2) on said first optical path branching means constant, and said first lens (101-1), said third lens (101-2), and said observation scanning means (117-1, 117-2) are disposed so as to make light parallel on the optical path (L2) of the observation light between said first lens (101-1) and said third lens (101-2). scanning means (122-1, 122-2) provided on an optical path (L1) of the measurement light configured to scan the measurement light on the fundus; a second lens (101-3) disposed between said scanning means (122-1, 122-2) and the first lens (101-1) on the optical path (L1) of the measurement light; first optical path branching means disposed between the first lens (101-1) and said second lens (101-3) configured to make the optical path of the measurement light branch off to a fundus observation optical path (L2) for observation of the fundus ; observation scanning means (117-1, 117-2) configured to scan observation light emitted from an observation light source on the fundus; and a third lens (101-2) disposed between said observation scanning means (117-1, 117-2) and the first optical path branching means on the fundus observation optical path (L2), characterized in that said first lens (101-1), said second lens (101-3), and said scanning means (122-1, 122-2) are disposed so as to make light parallel on the optical path (L1) of the measurement light between said first lens (101-1) and said second lens (101-3), and to make an incident angle of the measurement light scanned by said scanning means (122-1, 122-2) on said first optical path branching means constant, and said first lens (101-1), said third lens (101-2), and said observation scanning means (117-1, 117-2) are disposed so as to make light parallel on the optical path (L2) of the observation light between said first lens (101-1) and said third lens (101-2). <EOS>