A storage element comprising: an envelope; an external terminal having an exposed surface which is exposed to the outside of the envelope; a current collector which is contained inside of the envelope and is connected to the external terminal; and a power generating element which is contained inside of the envelope and is connected to the current collector, wherein the external terminal includes: a flat portion exposed to the outside of the envelope; and a shaft projecting from the flat portion to the inside of the envelope and being connected to the current collector, wherein the external terminal comprises a plate-like member and a rod-like connecting member, the rod-like connecting member is inserted into a through hole formed in the plate-like member, the plate-like member has an exposed surface, and an end surface of the rod-like connecting member constitutes a part of the exposed surface of the plate-like member, wherein the rod-like connecting member comprises a rivet having a flange and a shaft extending from the flange. characterised in that the flange of the rivet is press-fitted into the through hole of the plate-like member so that the flange constitutes a part of the exposed surface of the plate-like member. an envelope; an external terminal having an exposed surface which is exposed to the outside of the envelope; a current collector which is contained inside of the envelope and is connected to the external terminal; and a power generating element which is contained inside of the envelope and is connected to the current collector, wherein the external terminal includes: a flat portion exposed to the outside of the envelope; and a shaft projecting from the flat portion to the inside of the envelope and being connected to the current collector, wherein the external terminal comprises a plate-like member and a rod-like connecting member, the rod-like connecting member is inserted into a through hole formed in the plate-like member, the plate-like member has an exposed surface, and an end surface of the rod-like connecting member constitutes a part of the exposed surface of the plate-like member, wherein the rod-like connecting member comprises a rivet having a flange and a shaft extending from the flange. characterised in that the flange of the rivet is press-fitted into the through hole of the plate-like member so that the flange constitutes a part of the exposed surface of the plate-like member. a flat portion exposed to the outside of the envelope; and a shaft projecting from the flat portion to the inside of the envelope and being connected to the current collector, wherein the external terminal comprises a plate-like member and a rod-like connecting member, the rod-like connecting member is inserted into a through hole formed in the plate-like member, the plate-like member has an exposed surface, and an end surface of the rod-like connecting member constitutes a part of the exposed surface of the plate-like member, wherein the rod-like connecting member comprises a rivet having a flange and a shaft extending from the flange. characterised in that the flange of the rivet is press-fitted into the through hole of the plate-like member so that the flange constitutes a part of the exposed surface of the plate-like member.