A tilting-pad thrust bearing for supporting the axial load of a rotary shaft via a thrust collar fixed to the outer circumferential side of the rotary shaft, the bearing comprising: a plurality of pads swayingly disposed on the outer circumferential side of the rotary shaft so as to face the thrust collar; a plurality of oil inlets disposed in spaces between the plurality of pads or at leading end sections of sliding surfaces of the pads; and characterised by: a plurality of outflow guide grooves formed on the sliding surfaces of the pads and each located at a position closer to an inner circumferential edge of the sliding surface of the pad than a width-directional center of the sliding surface of the pad such that the plurality of outflow guide grooves extend in a circumferential direction; and a plurality of inflow guide grooves provided separately from the plurality of outflow guide grooves and formed at the leading end sections of the sliding surfaces of the pads so as to be located more radially inward than the plurality of oil inlets, wherein each of the outflow guide grooves is open to the sliding surface and a trailing end surface of the pad, wherein each of the inflow guide grooves is open to a leading end surface of the pad so as to form an opening wide enough to include the same radial position as that of the opening of the outflow guide groove on the trailing end surface of the pad, and wherein each of the inflow guide grooves is also open to the sliding surface of the pad so as to form an opening wide enough to cover a radially outer area than the radial position of the outflow guide groove on the sliding surface of the pad. a plurality of pads swayingly disposed on the outer circumferential side of the rotary shaft so as to face the thrust collar; a plurality of oil inlets disposed in spaces between the plurality of pads or at leading end sections of sliding surfaces of the pads; and characterised by: a plurality of outflow guide grooves formed on the sliding surfaces of the pads and each located at a position closer to an inner circumferential edge of the sliding surface of the pad than a width-directional center of the sliding surface of the pad such that the plurality of outflow guide grooves extend in a circumferential direction; and a plurality of inflow guide grooves provided separately from the plurality of outflow guide grooves and formed at the leading end sections of the sliding surfaces of the pads so as to be located more radially inward than the plurality of oil inlets, wherein each of the outflow guide grooves is open to the sliding surface and a trailing end surface of the pad, wherein each of the inflow guide grooves is open to a leading end surface of the pad so as to form an opening wide enough to include the same radial position as that of the opening of the outflow guide groove on the trailing end surface of the pad, and wherein each of the inflow guide grooves is also open to the sliding surface of the pad so as to form an opening wide enough to cover a radially outer area than the radial position of the outflow guide groove on the sliding surface of the pad. a plurality of outflow guide grooves formed on the sliding surfaces of the pads and each located at a position closer to an inner circumferential edge of the sliding surface of the pad than a width-directional center of the sliding surface of the pad such that the plurality of outflow guide grooves extend in a circumferential direction; and a plurality of inflow guide grooves provided separately from the plurality of outflow guide grooves and formed at the leading end sections of the sliding surfaces of the pads so as to be located more radially inward than the plurality of oil inlets, wherein each of the outflow guide grooves is open to the sliding surface and a trailing end surface of the pad, wherein each of the inflow guide grooves is open to a leading end surface of the pad so as to form an opening wide enough to include the same radial position as that of the opening of the outflow guide groove on the trailing end surface of the pad, and wherein each of the inflow guide grooves is also open to the sliding surface of the pad so as to form an opening wide enough to cover a radially outer area than the radial position of the outflow guide groove on the sliding surface of the pad.