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A backrest of a motorcycle is provided with a pair of angle-adjusting units. In each angle-adjusting unit, a metal arm of the backrest is pivotally connected, by a connecting shaft, to an inner side of each of a seat stay mounted along a side of a seat. A retaining unit selectively and detachably re

A backrest of a motorcycle is provided with a pair of angle-adjusting units. In each angle-adjusting unit, a metal arm of the backrest is pivotally connected, by a connecting shaft, to an inner side of each of a seat stay mounted along a side of a seat. A retaining unit selectively and detachably retains a lower end of the metal arm at a plurality of retaining positions. The retaining unit is biased by a biasing member in a retaining direction.

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What is claimed is: 1. A backrest assembly for a motorcycle, the backrest assembly comprising: a pivotable backrest configured for attachment behind a seat of the motorcycle, the backrest including a back support member and a pair of metal arms extending downward from two sides of the back support

What is claimed is: 1. A backrest assembly for a motorcycle, the backrest assembly comprising: a pivotable backrest configured for attachment behind a seat of the motorcycle, the backrest including a back support member and a pair of metal arms extending downward from two sides of the back support member to support the back support member; and a pair of angle-adjusting units that adjust the angle of the backrest to a desired angle, each of the angle-adjusting units including a connecting shaft configured to pivotally connect one of the metal arms to an inner side of a seat stay provided along a side of the seat, a retaining unit that selectively and detachably retains a lower end of the corresponding metal arm below the connecting shaft at a plurality of retaining positions, and a biasing member that biases the retaining unit in a retaining direction. 2. The backrest assembly according to claim 1, wherein each retaining unit includes a base member and a claw, wherein said base member has a plurality of recesses and is configured for attachment to one of the corresponding metal arm and the corresponding seat stay, and said claw is configured for attachment to the other of the corresponding metal arm and the corresponding seat stay so as to be selectively and separably retained in the recesses, and one of the claw and the base member is biased in the retaining direction by the biasing member. 3. The backrest assembly according to claim 2, further comprising: a pair of sliding members, each of the sliding members being slidable along the corresponding metal arm, wherein each of the base members is configured for attachment to the corresponding seat stay with the recesses opposing the lower end of the corresponding metal arm, the claw extending from a lower end of the sliding member toward the recesses of the base member, and the biasing member biasing the claw through the sliding member in a direction such as to retain the claw in the recesses. 4. A motorcycle having the backrest assembly of claim 3. 5. A motorcycle having the backrest assembly of claim 2. 6. A motorcycle having the backrest assembly of claim 1. 7. A backrest assembly for a motorcycle, the backrest assembly comprising: a pivotable backrest configured for attachment behind a seat of the motorcycle, the backrest including a back support member and a pair of metal arms extending downward from two sides of the back support member to support the back support member; and a pair of means for adjusting the angle of the backrest to a desired angle, each of the means for adjusting including a connecting shaft means for pivotally connecting one of the metal arms to an inner side of a seat stay provided along a side of the seat, a means for selectively and detachably retaining a lower end of the corresponding metal arm below the connecting shaft means at a plurality of retaining positions, and a means for biasing the means for retaining in a retaining direction. 8. The backrest assembly according to claim 7, wherein each means for retaining includes a base member and a claw, wherein said base member has a plurality of recesses and is configured for attachment to one of the corresponding metal arm and the corresponding seat stay, and said claw is configured for attachment to the other of the corresponding metal arm and the corresponding seat stay so as to be selectively and separably retained in the recesses, and one of the claw and the base member is biased in the retaining direction by the means for retaining. 9. A motorcycle having the backrest assembly of claim 8. 10. The backrest assembly according to claim 8, further comprising: a pair of means for sliding along the corresponding metal arm, wherein each of the base members is configured for attachment to the corresponding seat stay with the recesses opposing the lower end of the corresponding metal arm, the claw extending from a lower end of the corresponding means for sliding and toward the recesses of the base member, and the means for biasing biases the claw through the means for sliding in a direction such as to retain the claw in the recesses. 11. A motorcycle having the backrest assembly of claim 10. 12. A motorcycle having the backrest assembly of claim 7.