A double-lock caster comprising: a stem erected on a support yoke which pivotally supports a wheel; a cam which is incorporated in an upper part of the stem and rotates by a rotary shaft; a plurality of braking and braking release cam surfaces formed at predetermined positions on an outer peripheral surface of the cam; an operating shaft which abuts against the cam surfaces and slides up and down; a swivel-preventing plate part fixed to a lower end of the operating shaft; an engagement member which is fixed to the support yoke, and engages with the swivel-preventing plate part to regulate swiveling of the support yoke; a brake shoe part which is fixed to a lower part of the swivel-preventing plate part, and abuts against a tread surface of the wheel by downward movement of the operating shaft to perform braking; a link cam which is coupled with the brake shoe part, and has one end side pivotally supported by a bearing part extending to an outer side of the wheel and the other end side being latched on a brake plate which slides up and down along an outer surface of the support yoke; and a braking protruding part which is provided on the brake plate and engageable with an annularly continuous engagement receiving part formed on an inner peripheral side surface of the wheel, wherein downward movement of the operating shaft causes the engagement member to engage with the swivel-preventing plate part and causes the brake shoe part to abut against the tread surface of the wheel and, at the same time, pivotal movement of the link cam causes the brake plate to slide so that the braking protruding part engages with the engagement receiving part of the wheel, thereby performing swivel regulation and double braking, and wherein a vertically extending slit is formed in a back surface of the support yoke, and a rail part having a T-like cross section is provided to protrude on a back surface of a support member which supports the engagement member, a central piece of the rail part is inserted into the slit to latch the support member on the support yoke, and a fixing shaft is press-fitted into a hole laterally piercing through the support yoke and the support member to fix the engagement member to the support yoke through the support member. a stem erected on a support yoke which pivotally supports a wheel; a cam which is incorporated in an upper part of the stem and rotates by a rotary shaft; a plurality of braking and braking release cam surfaces formed at predetermined positions on an outer peripheral surface of the cam; an operating shaft which abuts against the cam surfaces and slides up and down; a swivel-preventing plate part fixed to a lower end of the operating shaft; an engagement member which is fixed to the support yoke, and engages with the swivel-preventing plate part to regulate swiveling of the support yoke; a brake shoe part which is fixed to a lower part of the swivel-preventing plate part, and abuts against a tread surface of the wheel by downward movement of the operating shaft to perform braking; a link cam which is coupled with the brake shoe part, and has one end side pivotally supported by a bearing part extending to an outer side of the wheel and the other end side being latched on a brake plate which slides up and down along an outer surface of the support yoke; and a braking protruding part which is provided on the brake plate and engageable with an annularly continuous engagement receiving part formed on an inner peripheral side surface of the wheel, wherein downward movement of the operating shaft causes the engagement member to engage with the swivel-preventing plate part and causes the brake shoe part to abut against the tread surface of the wheel and, at the same time, pivotal movement of the link cam causes the brake plate to slide so that the braking protruding part engages with the engagement receiving part of the wheel, thereby performing swivel regulation and double braking, and wherein a vertically extending slit is formed in a back surface of the support yoke, and a rail part having a T-like cross section is provided to protrude on a back surface of a support member which supports the engagement member, a central piece of the rail part is inserted into the slit to latch the support member on the support yoke, and a fixing shaft is press-fitted into a hole laterally piercing through the support yoke and the support member to fix the engagement member to the support yoke through the support member.