A bicycle comprising a braking system capable of executing an antilock braking control, and a front fork , the braking system comprising a hydraulic pressure control unit mounted on the bicycle , the hydraulic pressure control unit comprising: a base body in which an internal flow path through which brake liquid flows is formed; an inlet valve which is attached to the base body , is opened and closed when the antilock braking control is executed, and is driven by a first coil ; an outlet valve which is attached to the base body , is opened and closed when the antilock braking control is executed, and is driven by a second coil ; a coil casing in which the first coil and the second coil are accommodated; and a fixing member , wherein the fixing member is joined to the coil casing in a state where a columnar space with both ends opened is formed between a partial region of an outer surface of the coil casing and a partial region of an outer surface of the fixing member , or the fixing member is joined to the base body in a state where a columnar space with both ends opened is formed between a partial region of an outer surface of the base body and the partial region of the outer surface of the fixing member , characterized in that the hydraulic pressure control unit is joined to the front fork in a state where the front fork is positioned in the columnar space . a braking system capable of executing an antilock braking control, and a front fork , the braking system comprising a hydraulic pressure control unit mounted on the bicycle , the hydraulic pressure control unit comprising: a base body in which an internal flow path through which brake liquid flows is formed; an inlet valve which is attached to the base body , is opened and closed when the antilock braking control is executed, and is driven by a first coil ; an outlet valve which is attached to the base body , is opened and closed when the antilock braking control is executed, and is driven by a second coil ; a coil casing in which the first coil and the second coil are accommodated; and a fixing member , wherein the fixing member is joined to the coil casing in a state where a columnar space with both ends opened is formed between a partial region of an outer surface of the coil casing and a partial region of an outer surface of the fixing member , or the fixing member is joined to the base body in a state where a columnar space with both ends opened is formed between a partial region of an outer surface of the base body and the partial region of the outer surface of the fixing member , a base body in which an internal flow path through which brake liquid flows is formed; an inlet valve which is attached to the base body , is opened and closed when the antilock braking control is executed, and is driven by a first coil ; an outlet valve which is attached to the base body , is opened and closed when the antilock braking control is executed, and is driven by a second coil ; a coil casing in which the first coil and the second coil are accommodated; and a fixing member , wherein the fixing member is joined to the coil casing in a state where a columnar space with both ends opened is formed between a partial region of an outer surface of the coil casing and a partial region of an outer surface of the fixing member , or the fixing member is joined to the base body in a state where a columnar space with both ends opened is formed between a partial region of an outer surface of the base body and the partial region of the outer surface of the fixing member , characterized in that the hydraulic pressure control unit is joined to the front fork in a state where the front fork is positioned in the columnar space . <EOS>