An artificial satellite (A, B, C) comprising: an electronic component; a case that forms a storage space for the electronic component; and a solar cell panel that is connected with the electronic component, wherein the case comprises: a plurality of support posts being disposed parallel to each other; and a plurality of panels being provided between the plurality of support posts, respectively, the plurality of panels constituting outer walls, at least one panel of the plurality of panels is a panel having an outer surface on which the solar cell panel is provided, and characterized in that each support post includes side surfaces, into each of which a groove is formed in a longitudinal direction of the support post, each panel is provided between adjacent support posts by inserting edge portions of the panel into the grooves of the adjacent support posts, each groove penetrates through the support post in the longitudinal direction so as to open on both end portions of the support post so that the edge portions of the panel can be inserted into the grooves of the adjacent support posts in the longitudinal direction from the end portions of the adjacent support posts. an electronic component; a case that forms a storage space for the electronic component; and a solar cell panel that is connected with the electronic component, wherein the case comprises: a plurality of support posts being disposed parallel to each other; and a plurality of panels being provided between the plurality of support posts, respectively, the plurality of panels constituting outer walls, at least one panel of the plurality of panels is a panel having an outer surface on which the solar cell panel is provided, and characterized in that each support post includes side surfaces, into each of which a groove is formed in a longitudinal direction of the support post, each panel is provided between adjacent support posts by inserting edge portions of the panel into the grooves of the adjacent support posts, each groove penetrates through the support post in the longitudinal direction so as to open on both end portions of the support post so that the edge portions of the panel can be inserted into the grooves of the adjacent support posts in the longitudinal direction from the end portions of the adjacent support posts. a plurality of support posts being disposed parallel to each other; and a plurality of panels being provided between the plurality of support posts, respectively, the plurality of panels constituting outer walls, at least one panel of the plurality of panels is a panel having an outer surface on which the solar cell panel is provided, and characterized in that each support post includes side surfaces, into each of which a groove is formed in a longitudinal direction of the support post, each panel is provided between adjacent support posts by inserting edge portions of the panel into the grooves of the adjacent support posts, each groove penetrates through the support post in the longitudinal direction so as to open on both end portions of the support post so that the edge portions of the panel can be inserted into the grooves of the adjacent support posts in the longitudinal direction from the end portions of the adjacent support posts.