A connecting structure, comprising: an electrical connector, wherein said electrical connector includes: a housing; a terminal held with the housing; and said housing includes a fixed housing to be fixed to an electrical circuit board and a movable housing configured to be movable relative to the fixed housing, said movable housing is configured to accommodate a mating connecting member, said terminal includes a connecting portion to be connected to the electrical circuit board on one end portion thereof and a contact portion to be contacted with the mating connecting member on the other end portion thereof, said terminal further includes a fixed side held portion held with the fixed housing, a movable side held portion held with the movable housing, and an elastic portion connecting the fixed side held portion and the movable side held portion, and configured to be capable of elastically deforming, characterized in that said electrical connector includes a regulating portion wherein said regulating portion is disposed on the fixed housing and the movable housing for regulating the elastic portion from elastically deforming within a specific elastic deformation range in a direction that the electrical connector is fitted, and said elastic portion is configured to have a specific spring force when the elastic portion is elastically deformed to a maximum elastic deformation amount within the specific elastic deformation range so that the spring force is smaller than a holding force between the connecting portion of the terminal and the mating connecting member in a direction that the electrical connector is pulled out when the electrical connector is connected to the mating connecting member. an electrical connector, wherein said electrical connector includes: a housing; a terminal held with the housing; and said housing includes a fixed housing to be fixed to an electrical circuit board and a movable housing configured to be movable relative to the fixed housing, a housing; a terminal held with the housing; and said housing includes a fixed housing to be fixed to an electrical circuit board and a movable housing configured to be movable relative to the fixed housing, said movable housing is configured to accommodate a mating connecting member, said terminal includes a connecting portion to be connected to the electrical circuit board on one end portion thereof and a contact portion to be contacted with the mating connecting member on the other end portion thereof, said terminal further includes a fixed side held portion held with the fixed housing, a movable side held portion held with the movable housing, and an elastic portion connecting the fixed side held portion and the movable side held portion, and configured to be capable of elastically deforming, characterized in that said electrical connector includes a regulating portion wherein said regulating portion is disposed on the fixed housing and the movable housing for regulating the elastic portion from elastically deforming within a specific elastic deformation range in a direction that the electrical connector is fitted, and said elastic portion is configured to have a specific spring force when the elastic portion is elastically deformed to a maximum elastic deformation amount within the specific elastic deformation range so that the spring force is smaller than a holding force between the connecting portion of the terminal and the mating connecting member in a direction that the electrical connector is pulled out when the electrical connector is connected to the mating connecting member.