A hinge device for making a second housing openable and closable with respect to a first housing, for use in an electronic device with the first housing and the second housing, the hinge device comprising: a shaft configured to be connected to the first housing; a lever having an end into which the shaft is inserted, the lever being rotatable around an axis of the shaft, and the lever having another end configured to be connected to the second housing; a friction plate that is situated next to the lever, and into which friction plate the shaft is inserted, wherein the friction plate is not rotatable around the axis of the shaft; and a pressing section configured to press the friction plate in a direction of the lever along the axis of the shaft, wherein: contact faces (12C, 13B) of the lever and the friction plate are formed to have a conical shape, and characterized by the hinge device further comprising: a first clamp that is situated between the friction plate and the pressing section, the first clamp into which the shaft is inserted, the first clamp being rotatable around the axis of the shaft, the first clamp having an engaging section between the first clamp and the lever and rotating in synchronism with the lever; and a second clamp that is situated between the first clamp and the pressing section, and into which second clamp the shaft is inserted, the second clamp that is not rotatable around the axis of the shaft, wherein contact faces of the first clamp and the second clamp are formed to have depressions (21C, 22C) and projections (21B, 22B), and contact faces (13C, 21D) of the first clamp and the friction plate are formed to have a conical shape. a shaft configured to be connected to the first housing; a lever having an end into which the shaft is inserted, the lever being rotatable around an axis of the shaft, and the lever having another end configured to be connected to the second housing; a friction plate that is situated next to the lever, and into which friction plate the shaft is inserted, wherein the friction plate is not rotatable around the axis of the shaft; and a pressing section configured to press the friction plate in a direction of the lever along the axis of the shaft, wherein: contact faces (12C, 13B) of the lever and the friction plate are formed to have a conical shape, and characterized by the hinge device further comprising: a first clamp that is situated between the friction plate and the pressing section, the first clamp into which the shaft is inserted, the first clamp being rotatable around the axis of the shaft, the first clamp having an engaging section between the first clamp and the lever and rotating in synchronism with the lever; and a second clamp that is situated between the first clamp and the pressing section, and into which second clamp the shaft is inserted, the second clamp that is not rotatable around the axis of the shaft, wherein contact faces of the first clamp and the second clamp are formed to have depressions (21C, 22C) and projections (21B, 22B), and contact faces (13C, 21D) of the first clamp and the friction plate are formed to have a conical shape. contact faces (12C, 13B) of the lever and the friction plate are formed to have a conical shape, and characterized by the hinge device further comprising: a first clamp that is situated between the friction plate and the pressing section, the first clamp into which the shaft is inserted, the first clamp being rotatable around the axis of the shaft, the first clamp having an engaging section between the first clamp and the lever and rotating in synchronism with the lever; and a second clamp that is situated between the first clamp and the pressing section, and into which second clamp the shaft is inserted, the second clamp that is not rotatable around the axis of the shaft, wherein contact faces of the first clamp and the second clamp are formed to have depressions (21C, 22C) and projections (21B, 22B), and contact faces (13C, 21D) of the first clamp and the friction plate are formed to have a conical shape. a first clamp that is situated between the friction plate and the pressing section, the first clamp into which the shaft is inserted, the first clamp being rotatable around the axis of the shaft, the first clamp having an engaging section between the first clamp and the lever and rotating in synchronism with the lever; and a second clamp that is situated between the first clamp and the pressing section, and into which second clamp the shaft is inserted, the second clamp that is not rotatable around the axis of the shaft, wherein contact faces of the first clamp and the second clamp are formed to have depressions (21C, 22C) and projections (21B, 22B), and contact faces (13C, 21D) of the first clamp and the friction plate are formed to have a conical shape.