Sealing structure with annular pocket and sealing device

A sealing structure with an annular pocket and a sealing device, wherein the annular pocket has an outer peripheral surface having an annular shape around an axis and extending along the axis, forms a recessed part which has an annular shape around the axis and is recessed to one side in a direction of the axis, and is provided to a shaft member that penetrates through a through-hole of an attachment target portion to which the sealing device is attached, and is rotatable around the axis, or a functional member attached to the shaft member;

• the sealing device includes a seal lip having an annular shape around the axis, and a side lip which is has an annular shape around the axis and extends to the one side in the direction of the axis, and is attached to the through-hole of the attachment target portion to perform sealing between the shaft member or the functional member and the through-hole;
• in the sealing device attached to the attachment target portion, the seal lip is slidably in contact with the shaft member or the functional member directly or indirectly, and the side lip extends to the annular pocket to form an annular gap between the side lip and the outer peripheral surface of the annular pocket;
• and
• the outer peripheral surface of the annular pocket increases in diameter toward the one side in the direction of the axis, and includes at least one foreign matter discharge groove as a groove which extends from the one side to another side in the direction of the axis and is recessed in an outer peripheral direction.