An electronic apparatus to which a portable apparatus is detachably mountable, the electronic apparatus comprising: a holding portion for detachably holding the portable apparatus; a main operating portion for operating the electronic apparatus and/or the portable apparatus when it is attached to the holding portion; a removal operating portion for detaching the portable apparatus; and a connector, provided in the holding portion, for electrically connecting the electronic apparatus to a corresponding connector of the portable apparatus, wherein: the holding portion, the main operating portion, and the removal operating portion are provided on a front face of the electronic apparatus; and the main operating portion and the removal operating portion are provided at opposing sides of the front face interposing the holding portion; characterized in that the electronic apparatus further comprises: a guide mechanism (171, 200) configured to guide the portable apparatus so as to set one side of the portable apparatus as an axis and to cause another side opposing the one side to rotate about the axis, when the portable apparatus is attached and/or detached to or from the holding portion, wherein the removal operating portion is located closer to the said other side of the portable apparatus than to the said one side thereof, when attached, and wherein the connector is provided closer to the said other side of the portable apparatus than to the said one side of the portable apparatus set as the axis, so as to facilitate fitting or releasing of the connector to the corresponding connector of the portable apparatus when the portable apparatus is attached or detached from the electronic apparatus. a holding portion for detachably holding the portable apparatus; a main operating portion for operating the electronic apparatus and/or the portable apparatus when it is attached to the holding portion; a removal operating portion for detaching the portable apparatus; and a connector, provided in the holding portion, for electrically connecting the electronic apparatus to a corresponding connector of the portable apparatus, wherein: the holding portion, the main operating portion, and the removal operating portion are provided on a front face of the electronic apparatus; and the main operating portion and the removal operating portion are provided at opposing sides of the front face interposing the holding portion; characterized in that the electronic apparatus further comprises: a guide mechanism (171, 200) configured to guide the portable apparatus so as to set one side of the portable apparatus as an axis and to cause another side opposing the one side to rotate about the axis, when the portable apparatus is attached and/or detached to or from the holding portion, wherein the removal operating portion is located closer to the said other side of the portable apparatus than to the said one side thereof, when attached, and wherein the connector is provided closer to the said other side of the portable apparatus than to the said one side of the portable apparatus set as the axis, so as to facilitate fitting or releasing of the connector to the corresponding connector of the portable apparatus when the portable apparatus is attached or detached from the electronic apparatus. the holding portion, the main operating portion, and the removal operating portion are provided on a front face of the electronic apparatus; and the main operating portion and the removal operating portion are provided at opposing sides of the front face interposing the holding portion; characterized in that the electronic apparatus further comprises: a guide mechanism (171, 200) configured to guide the portable apparatus so as to set one side of the portable apparatus as an axis and to cause another side opposing the one side to rotate about the axis, when the portable apparatus is attached and/or detached to or from the holding portion, wherein the removal operating portion is located closer to the said other side of the portable apparatus than to the said one side thereof, when attached, and wherein the connector is provided closer to the said other side of the portable apparatus than to the said one side of the portable apparatus set as the axis, so as to facilitate fitting or releasing of the connector to the corresponding connector of the portable apparatus when the portable apparatus is attached or detached from the electronic apparatus.