A tilting-pad bearing device, comprising: a plurality of bearing pads disposed around a rotation shaft so as to support the rotation shaft rotatably; a support member interposed between the plurality of bearing pads and a bearing housing supporting the plurality of bearing pads, each of the plurality of bearing pads being point-supported pivotably by the support member; and an oil-supply mechanism configured to supply a lubricant oil to at least one oil groove formed on a bearing surface of at least one of the plurality of bearing pads through an oil supply inlet communicating with each of the at least one oil groove, wherein the support member is disposed so as to be offset from a middle position of the at least one bearing pad in a rotational direction of the rotation shaft, toward an upstream side or a downstream side in the rotational direction of the rotation shaft, wherein a weighted mean position of the at least one oil groove representing a mean position of a respective center position of the at least one oil groove in a circumferential direction of the rotation shaft weighted by a respective opening area of the at least one oil groove is offset from a support point of said each of the plurality of bearing pads by the support member, in an offset direction of the support member based on the middle position, and wherein each of the at least one oil groove is disposed along a portion of an ellipse on the bearing surface, the ellipse corresponding to a constant pressure line passing through positions having same pressure of an oil film formed between the bearing surface and the outer circumferential surface of the rotation shaft when the rotation shaft is rotating. a plurality of bearing pads disposed around a rotation shaft so as to support the rotation shaft rotatably; a support member interposed between the plurality of bearing pads and a bearing housing supporting the plurality of bearing pads, each of the plurality of bearing pads being point-supported pivotably by the support member; and an oil-supply mechanism configured to supply a lubricant oil to at least one oil groove formed on a bearing surface of at least one of the plurality of bearing pads through an oil supply inlet communicating with each of the at least one oil groove, wherein the support member is disposed so as to be offset from a middle position of the at least one bearing pad in a rotational direction of the rotation shaft, toward an upstream side or a downstream side in the rotational direction of the rotation shaft, wherein a weighted mean position of the at least one oil groove representing a mean position of a respective center position of the at least one oil groove in a circumferential direction of the rotation shaft weighted by a respective opening area of the at least one oil groove is offset from a support point of said each of the plurality of bearing pads by the support member, in an offset direction of the support member based on the middle position, and wherein each of the at least one oil groove is disposed along a portion of an ellipse on the bearing surface, the ellipse corresponding to a constant pressure line passing through positions having same pressure of an oil film formed between the bearing surface and the outer circumferential surface of the rotation shaft when the rotation shaft is rotating.