A foil bearing (30, 40, 50), comprising foils (32, 42, 52) which are arranged at a plurality of portions in a rotation direction of a shaft member to be supported, the foils (32, 42, 52) each having a front end (321, 421) located on the rotation direction side and a rear end (322, 422) located on a side opposite to the rotation direction side, the foils (32, 42, 52) each forming a top foil portion (Tf) comprising a bearing surface (S1, S2, S3) in a region including the front end (321, 421) of the foil (32, 42, 52) and a back foil portion (Bf), which is arranged behind the top foil portion (Tf) by causing the top foil portion (Tf) to override on the back foil portion (Bf) of adjacent one of the foils (32, 42, 52) in a region including the rear end (322, 422) of the foil (32, 42, 52), wherein one of the foils (32, 42) is configured as an intermediate foil, wherein, of the two of the foils (32, 42, 52) adjacent to the intermediate foil on the rotation direction side and the side opposite to the rotation direction side, the rear end (322, 422) of the foil on the rotation direction side and the front end (321, 421) of the foil on the side opposite to the rotation direction side have contour shapes different from each other, and a gap in the rotation direction is secured between the rear end (322, 422) of the foil on the rotation direction side and the front end (321, 421) of the foil on the side opposed to the rotation direction side, wherein a width of the gap is set to be non-uniform in a direction orthogonal to the rotation direction, and wherein a support span of the intermediate foil sandwiched between the rear end (322, 422) of the foil (32, 42, 52) on the rotation direction side and the front end (321, 421) of the foil (32, 42, 52) on the side opposite to the rotation direction side is varied. the foils (32, 42, 52) each having a front end (321, 421) located on the rotation direction side and a rear end (322, 422) located on a side opposite to the rotation direction side, the foils (32, 42, 52) each forming a top foil portion (Tf) comprising a bearing surface (S1, S2, S3) in a region including the front end (321, 421) of the foil (32, 42, 52) and a back foil portion (Bf), which is arranged behind the top foil portion (Tf) by causing the top foil portion (Tf) to override on the back foil portion (Bf) of adjacent one of the foils (32, 42, 52) in a region including the rear end (322, 422) of the foil (32, 42, 52), wherein one of the foils (32, 42) is configured as an intermediate foil, wherein, of the two of the foils (32, 42, 52) adjacent to the intermediate foil on the rotation direction side and the side opposite to the rotation direction side, the rear end (322, 422) of the foil on the rotation direction side and the front end (321, 421) of the foil on the side opposite to the rotation direction side have contour shapes different from each other, and a gap in the rotation direction is secured between the rear end (322, 422) of the foil on the rotation direction side and the front end (321, 421) of the foil on the side opposed to the rotation direction side, wherein a width of the gap is set to be non-uniform in a direction orthogonal to the rotation direction, and wherein a support span of the intermediate foil sandwiched between the rear end (322, 422) of the foil (32, 42, 52) on the rotation direction side and the front end (321, 421) of the foil (32, 42, 52) on the side opposite to the rotation direction side is varied.