Vehicular wheel bearing having improved sealing property of encoder

A vehicular wheel bearing (100) for rotatably mounting and supporting a vehicle wheel to a vehicle body, comprising:

• a wheel hub (200) to which the vehicle wheel is mounted and which rotates together with the vehicle wheel;
• at least one inner ring (300) mounted to the wheel hub (200);
• an outer ring (400) fixedly coupled to a vehicle-body-side member;
• a plurality of rolling elements (500) configured to rotatably support the wheel hub (200) and the inner ring (300) relative to the outer ring (400);
• an outboard-side sealing member (600) configured to perform sealing at an outer axial end portion of a bearing space in which the rolling elements (500) are disposed;
• and
• an inboard-side sealing member (700) configured to perform sealing at an inner axial end portion of the bearing space in which the rolling elements 500 are disposed,
• wherein the inboard-side sealing member (700) comprises an outer portion (710) mounted to the outer ring (400) in a press-fitted manner, and an inner portion (750) mounted to the inner ring (300) in a press-fitted manner,
• wherein an encoder (900) for wheel-speed detection is provided on one side of the inner portion (750),
• wherein a protrusion (910) extending radially inward is formed on an inner circumferential surface of the encoder (900),
• wherein the protrusion (910) of the encoder (900) is formed to have an inner diameter smaller than an outer diameter of an outer circumferential surface (310) of the inner ring (300) to which the inner portion (750) is mounted, in an undeformed state before assembly, and
• wherein the protrusion (910) of the encoder (900) is configured to contact the inner ring (300) in an assembled state.