A shaft seal device comprising: a housing that is disposed to face an outer peripheral surface of a rotor rotating about an axis, and a seal body that includes a plurality of thin plates, the plurality of thin plates extending inward from the housing in a radial direction of the rotor and being laminated in a circumferential direction of the rotor, wherein each of the plurality of thin plates includes: a contact portion that is defined as an area in which the thin plate comes into surface contact with the other thin plates provided on front and rear sides in a rotational direction of the rotor, the contact portion being formed in the vicinity of radially inner end portions of the thin plates; a non-contact portion which is defined as an area present outside the contact portion in the radial direction and in which the thin plate does not come into surface contact with the other thin plates; and wherein the plurality of thin plates are arranged so that an angle between each of the plurality of thin plates and the outer peripheral surface of the rotor is gradually increased toward a front side from a rear side in the rotational direction of the rotor when the rotor is stopped, and the plurality of thin plates are thus pressed against each other in the circumferential direction of the rotor, characterized in that the shaft seal device comprises a biasing member that is provided between the seal body and the housing, the biasing member being configured to bias the seal body to the outside in the radial direction. a housing that is disposed to face an outer peripheral surface of a rotor rotating about an axis, and a seal body that includes a plurality of thin plates, the plurality of thin plates extending inward from the housing in a radial direction of the rotor and being laminated in a circumferential direction of the rotor, wherein each of the plurality of thin plates includes: a contact portion that is defined as an area in which the thin plate comes into surface contact with the other thin plates provided on front and rear sides in a rotational direction of the rotor, the contact portion being formed in the vicinity of radially inner end portions of the thin plates; a non-contact portion which is defined as an area present outside the contact portion in the radial direction and in which the thin plate does not come into surface contact with the other thin plates; and wherein the plurality of thin plates are arranged so that an angle between each of the plurality of thin plates and the outer peripheral surface of the rotor is gradually increased toward a front side from a rear side in the rotational direction of the rotor when the rotor is stopped, and the plurality of thin plates are thus pressed against each other in the circumferential direction of the rotor, characterized in that the shaft seal device comprises a biasing member that is provided between the seal body and the housing, the biasing member being configured to bias the seal body to the outside in the radial direction. a contact portion that is defined as an area in which the thin plate comes into surface contact with the other thin plates provided on front and rear sides in a rotational direction of the rotor, the contact portion being formed in the vicinity of radially inner end portions of the thin plates; a non-contact portion which is defined as an area present outside the contact portion in the radial direction and in which the thin plate does not come into surface contact with the other thin plates; and wherein the plurality of thin plates are arranged so that an angle between each of the plurality of thin plates and the outer peripheral surface of the rotor is gradually increased toward a front side from a rear side in the rotational direction of the rotor when the rotor is stopped, and the plurality of thin plates are thus pressed against each other in the circumferential direction of the rotor, characterized in that the shaft seal device comprises a biasing member that is provided between the seal body and the housing, the biasing member being configured to bias the seal body to the outside in the radial direction.