Shell type roller bearing

A shell type roller bearing, comprising:

• a shell outer ring that includes a cylindrical portion and flanges extending radially inward from one axial end and the other axial end of the cylindrical portion and that is made of an austenitic stainless steel material;
• a seal member mounted in one axial end portion of the shell outer ring;
• rollers that make rolling contact with an inner peripheral surface of the cylindrical portion;
• and
• a cage disposed radially inside the shell outer ring and holding the rollers, wherein
• an inner diameter of one axial end portion of the inner peripheral surface is equal to or larger than an inner diameter of an axial middle region of the inner peripheral surface, and
• at least one of the flanges has a hardness in a range of 300 to 450 HV,
• a relief extending in a circumferential direction between the inner peripheral surface and one of the flanges is provided in an inner periphery of the shell outer ring,
• a tilted surface with a slope, the tilted surface connecting to the relief, a diameter of the tilted surface gradually increasing toward an outer side in an axis direction, and
• a boundary is positioned between the tilted surface and the relief, the boundary having a diameter greater than the inner diameter of the inner peripheral surface by a radial dimension that is a predetermined value of 20 μm or less.