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 close-contact with both of the inner ring and the ring member over an entire 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.