Bearing device for axle

A bearing device for an axle, comprising:

• a rolling bearing comprising an inner ring, an outer ring, and a plurality of rolling elements interposed between the inner ring and the outer ring;
• a ring member provided on one side of the inner ring in an axial direction;
• a spacer sandwiched by the inner ring and the ring member;
• and
• a sealing member, which is fixed to a radially outer end of the spacer, and is held in contact with both of the inner ring and the ring member along a periphery of the sealing member while being elastically deformed,
• wherein the bearing device for an axle has:
• a first axial gap, which is defined between the inner ring and the ring member in the axial direction, and has the spacer interposed therein;
• a second axial gap, which is larger than the first axial gap, and has the sealing member interposed therein;
• and
• a third axial gap, which is defined on a radially outer side of the second axial gap, and is smaller than the second axial gap, and wherein an inner diameter end of the third axial gap opens to the second axial gap.