A combustor comprising: a combustion liner having a tubular shape centered on an axis (Ac) and configured to allow a fuel to be burned on an inner circumferential side of the combustion liner; a sound attenuator (30, 30a, 30b) including part of a plate forming the combustion liner, and an acoustic cover (34, 34a, 34b) defining, in conjunction with the part of the plate, a space (36, 36a) on an outer circumferential side of the combustion liner wherein at least one passage penetrating to the space (36, 36a) from an exterior is defined in the acoustic cover (34, 34a, 34b) of the sound attenuator (30, 30a, 30b); and a restrictor (40, 40a, 40b) configured to, in a part in an axial direction (Da) in which the axis (Ac) extends, narrow and then widen a flow path of a gas flowing in the combustion liner, as the restrictor (40, 40a, 40b) extends from an upstream side that is one side in the axial direction (Da) toward a downstream side that is another side in the axial direction (Da), wherein a plurality of through-holes (33, 33a), penetrating to the space (36, 36a) from within the combustion liner is are defined in the part of the plate of the sound attenuator (30, 30a, 30b); the combustor characterized in that: a relative position in the axial direction (Da) of the restrictor (40, 40a, 40b) with respect to the sound attenuator (30, 30a, 30b) is a position such that at least some of the plurality of through-holes (33, 33a) in the sound attenuator (30, 30a, 30b) are present within a region spanning, in the axial direction (Da), from a position of a minimum restrictor diameter of the restrictor (40, 40a, 40b) to positions, on an upstream side and a downstream side, at a distance equivalent to a minimum restrictor radius that is half the minimum restrictor diameter. a combustion liner having a tubular shape centered on an axis (Ac) and configured to allow a fuel to be burned on an inner circumferential side of the combustion liner; a sound attenuator (30, 30a, 30b) including part of a plate forming the combustion liner, and an acoustic cover (34, 34a, 34b) defining, in conjunction with the part of the plate, a space (36, 36a) on an outer circumferential side of the combustion liner wherein at least one passage penetrating to the space (36, 36a) from an exterior is defined in the acoustic cover (34, 34a, 34b) of the sound attenuator (30, 30a, 30b); and a restrictor (40, 40a, 40b) configured to, in a part in an axial direction (Da) in which the axis (Ac) extends, narrow and then widen a flow path of a gas flowing in the combustion liner, as the restrictor (40, 40a, 40b) extends from an upstream side that is one side in the axial direction (Da) toward a downstream side that is another side in the axial direction (Da), wherein a plurality of through-holes (33, 33a), penetrating to the space (36, 36a) from within the combustion liner is are defined in the part of the plate of the sound attenuator (30, 30a, 30b); the combustor characterized in that: a relative position in the axial direction (Da) of the restrictor (40, 40a, 40b) with respect to the sound attenuator (30, 30a, 30b) is a position such that at least some of the plurality of through-holes (33, 33a) in the sound attenuator (30, 30a, 30b) are present within a region spanning, in the axial direction (Da), from a position of a minimum restrictor diameter of the restrictor (40, 40a, 40b) to positions, on an upstream side and a downstream side, at a distance equivalent to a minimum restrictor radius that is half the minimum restrictor diameter.