A planar waveguide laser pumping module comprising: a pumping light source; a planar laser medium ; a planar transparent member that has a refractive index equal to that of said laser medium , and that is joined to a surface of said laser medium ; a first clad (3-1) that has a refractive index smaller than those of said laser medium and said transparent member , and that is joined to a surface of said transparent member that is opposite to the surface of said transparent member joined to said laser medium ; a second clad (3-2) that has a refractive index smaller than those of said laser medium and said transparent member , that is joined to a surface of said laser medium opposite to the surface of said laser medium joined to said transparent member , and that sandwiches said transparent member and said laser medium between itself and said first clad (3-1) in order to generate a waveguide; and a heat sink that is joined to said laser medium via said second clad (3-2), wherein laser oscillations occur on a plurality of optical axes (9-1, 9-2, 9-3, 9-4) which are separately arranged at spacings in a planar direction of said laser medium , and pumping light from said pumping light source is incident in a direction perpendicular to said optical axes (9-1, 9-2, 9-3, 9-4) of said laser oscillations, and wherein the ratio of the thickness of the transparent member and that of the laser medium and the propagation angle (α) in the waveguide of the pumping light are adjusted such that the pumping light alternately propagates across said plurality of optical axes (9-1, 9-2, 9-3, 9-4) of said laser medium and in said transparent member in-between the adjacent optical axes (9-1, 9-2, 9-3, 9-4). a planar laser medium ; a planar transparent member that has a refractive index equal to that of said laser medium , and that is joined to a surface of said laser medium ; a first clad (3-1) that has a refractive index smaller than those of said laser medium and said transparent member , and that is joined to a surface of said transparent member that is opposite to the surface of said transparent member joined to said laser medium ; a second clad (3-2) that has a refractive index smaller than those of said laser medium and said transparent member , that is joined to a surface of said laser medium opposite to the surface of said laser medium joined to said transparent member , and that sandwiches said transparent member and said laser medium between itself and said first clad (3-1) in order to generate a waveguide; and a heat sink that is joined to said laser medium via said second clad (3-2), wherein laser oscillations occur on a plurality of optical axes (9-1, 9-2, 9-3, 9-4) which are separately arranged at spacings in a planar direction of said laser medium , and pumping light from said pumping light source is incident in a direction perpendicular to said optical axes (9-1, 9-2, 9-3, 9-4) of said laser oscillations, and wherein the ratio of the thickness of the transparent member and that of the laser medium and the propagation angle (α) in the waveguide of the pumping light are adjusted such that the pumping light alternately propagates across said plurality of optical axes (9-1, 9-2, 9-3, 9-4) of said laser medium and in said transparent member in-between the adjacent optical axes (9-1, 9-2, 9-3, 9-4). <EOS>