A lithographic printing plate precursor comprising: an image recording layer on a quadrilateral-shaped hydrophilic aluminum support, wherein a hydrophilic agent is distributed on each region within 1 cm from end portions of two sides, which face each other, of the support; wherein the lithographic printing plate precursor comprises a layer arrangement according to any one of the following i to iv; wherein the lithographic printing plate precursor comprises a layer containing the hydrophilic agent between a support and the innermost layer of the layer arrangement, between adjacent layers, or on the outermost layer other than a protective layer; wherein the layer containing the hydrophilic agent comes into contact with partial regions of the layer(s) between which or on which it is provided; the hydrophilic agent comprises one or more of a phosphoric acid compound, a phosphonic acid compound, a surfactant, and a water-soluble resin; wherein the hydrophilic agent is not attached to the rear surface of the support; wherein the image recording layer comprises an infrared absorber and the infrared absorber comprises a cyanine dye; and wherein a sagging amount of each of the end portions is 30 μm to 150 μm, wherein the distance X in a vertical direction of a portion which is curved downward from an extension line of the surface of the image recording layer represents the "sagging amount". i: support and image recording layer ii: support, undercoat layer, and image recording layer iii: support, image recording layer, and protective layer iv: support, undercoat layer, image recording layer, and protective layer an image recording layer on a quadrilateral-shaped hydrophilic aluminum support, wherein a hydrophilic agent is distributed on each region within 1 cm from end portions of two sides, which face each other, of the support; wherein the lithographic printing plate precursor comprises a layer arrangement according to any one of the following i to iv; wherein the lithographic printing plate precursor comprises a layer containing the hydrophilic agent between a support and the innermost layer of the layer arrangement, between adjacent layers, or on the outermost layer other than a protective layer; wherein the layer containing the hydrophilic agent comes into contact with partial regions of the layer(s) between which or on which it is provided; the hydrophilic agent comprises one or more of a phosphoric acid compound, a phosphonic acid compound, a surfactant, and a water-soluble resin; wherein the hydrophilic agent is not attached to the rear surface of the support; wherein the image recording layer comprises an infrared absorber and the infrared absorber comprises a cyanine dye; and wherein a sagging amount of each of the end portions is 30 μm to 150 μm, wherein the distance X in a vertical direction of a portion which is curved downward from an extension line of the surface of the image recording layer represents the "sagging amount". i: support and image recording layer ii: support, undercoat layer, and image recording layer iii: support, image recording layer, and protective layer iv: support, undercoat layer, image recording layer, and protective layer i: support and image recording layer ii: support, undercoat layer, and image recording layer iii: support, image recording layer, and protective layer iv: support, undercoat layer, image recording layer, and protective layer