An LED lamp for vertical lighting comprising: a plurality of LED elements; a light source support supporting the LED elements on a side surface, a hermetically sealed glass container surrounding the light source support and hermetically sealing to encapsulate a low molecular weight gas as a cooling gas therein, wherein: the light source support is supported by a support column extending from a stem fixed to an end portion of the hermetically sealed glass container so as to extend along a lamp axial line in an internal space of the hermetically sealed glass container; wherein the light source support surrounds a cooling gas flow channel along the lamp axial line; and the light source support comprises: a first open end and a second open end defining a through hole, in which the cooling gas flow channel is formed, between the first open end and the second open end along the lamp axial line so that a cooling gas stream (23-1, 23-2) flows from the first open end to the second open end; and a gas inlet and outlet disposed between the first open end and the second open end of the light source support, characterized in that the low molecular weight gas includes any of a helium gas, a hydrogen gas, and a neon gas, or a mixed gas of any combination of these, and the light source support has shapes expanded at both the end portions, and a cross-sectional area of the cooling gas flow channel is relatively narrower at a central portion as compared to both the end portions. a plurality of LED elements; a light source support supporting the LED elements on a side surface, a hermetically sealed glass container surrounding the light source support and hermetically sealing to encapsulate a low molecular weight gas as a cooling gas therein, wherein: the light source support is supported by a support column extending from a stem fixed to an end portion of the hermetically sealed glass container so as to extend along a lamp axial line in an internal space of the hermetically sealed glass container; wherein the light source support surrounds a cooling gas flow channel along the lamp axial line; and the light source support comprises: a first open end and a second open end defining a through hole, in which the cooling gas flow channel is formed, between the first open end and the second open end along the lamp axial line so that a cooling gas stream (23-1, 23-2) flows from the first open end to the second open end; and a gas inlet and outlet disposed between the first open end and the second open end of the light source support, characterized in that the low molecular weight gas includes any of a helium gas, a hydrogen gas, and a neon gas, or a mixed gas of any combination of these, and the light source support has shapes expanded at both the end portions, and a cross-sectional area of the cooling gas flow channel is relatively narrower at a central portion as compared to both the end portions. the light source support is supported by a support column extending from a stem fixed to an end portion of the hermetically sealed glass container so as to extend along a lamp axial line in an internal space of the hermetically sealed glass container; wherein the light source support surrounds a cooling gas flow channel along the lamp axial line; and the light source support comprises: a first open end and a second open end defining a through hole, in which the cooling gas flow channel is formed, between the first open end and the second open end along the lamp axial line so that a cooling gas stream (23-1, 23-2) flows from the first open end to the second open end; and a gas inlet and outlet disposed between the first open end and the second open end of the light source support, characterized in that the low molecular weight gas includes any of a helium gas, a hydrogen gas, and a neon gas, or a mixed gas of any combination of these, and the light source support has shapes expanded at both the end portions, and a cross-sectional area of the cooling gas flow channel is relatively narrower at a central portion as compared to both the end portions. a first open end and a second open end defining a through hole, in which the cooling gas flow channel is formed, between the first open end and the second open end along the lamp axial line so that a cooling gas stream (23-1, 23-2) flows from the first open end to the second open end; and a gas inlet and outlet disposed between the first open end and the second open end of the light source support, characterized in that the low molecular weight gas includes any of a helium gas, a hydrogen gas, and a neon gas, or a mixed gas of any combination of these, and the light source support has shapes expanded at both the end portions, and a cross-sectional area of the cooling gas flow channel is relatively narrower at a central portion as compared to both the end portions.