A brake caliper comprising: two caliper levers (40, 50) each retaining a brake pad; an output rod for outputting a force to move the caliper levers (40, 50) such that a single disc is sandwiched between the two brake pads; a gap adjuster fixedly attached between the two caliper levers (40, 50), the gap adjuster being configured to adjust gaps between the brake pads and the disc; a body retaining the two caliper levers (40, 50) in a movable manner and retaining the output rod; a displaceable portion (91, 191, 291, 391) fixedly attached to the body, the displaceable portion (91, 191, 291, 391) being displaceable when acted upon by the output rod if the output rod moves a predetermined distance or more; characterized in that the brake caliper further comprises: a guide member having ends fixedly attached to the body and the gap adjuster, the guide member being formed of a tubular flexible member longer than a distance between the body and the gap adjuster observed when relative displacement between the body and the gap adjuster exhibits a largest value; and a transmission member extending through the guide member to connect together the displaceable portion (91, 191, 291, 391) and an input unit (130, 131, 132) of the gap adjuster, the transmission member being configured to transmit a displacement of the displaceable portion (91, 191, 291, 391) to the input unit (130, 131, 132) in order to actuate the gap adjuster. two caliper levers (40, 50) each retaining a brake pad; an output rod for outputting a force to move the caliper levers (40, 50) such that a single disc is sandwiched between the two brake pads; a gap adjuster fixedly attached between the two caliper levers (40, 50), the gap adjuster being configured to adjust gaps between the brake pads and the disc; a body retaining the two caliper levers (40, 50) in a movable manner and retaining the output rod; a displaceable portion (91, 191, 291, 391) fixedly attached to the body, the displaceable portion (91, 191, 291, 391) being displaceable when acted upon by the output rod if the output rod moves a predetermined distance or more; characterized in that the brake caliper further comprises: a guide member having ends fixedly attached to the body and the gap adjuster, the guide member being formed of a tubular flexible member longer than a distance between the body and the gap adjuster observed when relative displacement between the body and the gap adjuster exhibits a largest value; and a transmission member extending through the guide member to connect together the displaceable portion (91, 191, 291, 391) and an input unit (130, 131, 132) of the gap adjuster, the transmission member being configured to transmit a displacement of the displaceable portion (91, 191, 291, 391) to the input unit (130, 131, 132) in order to actuate the gap adjuster. a guide member having ends fixedly attached to the body and the gap adjuster, the guide member being formed of a tubular flexible member longer than a distance between the body and the gap adjuster observed when relative displacement between the body and the gap adjuster exhibits a largest value; and a transmission member extending through the guide member to connect together the displaceable portion (91, 191, 291, 391) and an input unit (130, 131, 132) of the gap adjuster, the transmission member being configured to transmit a displacement of the displaceable portion (91, 191, 291, 391) to the input unit (130, 131, 132) in order to actuate the gap adjuster.