A wire harness manufacturing method comprising: an insertion step of inserting a binding member through an insertion hole of a protective member (1, 1A, 1B), the protective member (1, 1A, 1B) including: a main body that forms a routing space in which the wiring member is routed and has an opening that is open to one side in a first direction in the routing space; the insertion hole being a hole that is formed to penetrate the main body and through which the binding member can be inserted across inside and outside of the routing space; a temporary retention notch that is formed in a recessed shape at an end of the main body on a side of the opening in the first direction and allows insertion of the binding member in a state where the binding member is inserted through the insertion hole; and a temporary retention projection (4, 40A, 40B) that is formed to protrude from the main body toward a side of the temporary retention notch and capable of hooking and temporarily retaining the binding member in a state where the binding member is inserted through the temporary retention notch; a temporary retention step of inserting the binding member, which is in a state of being inserted through the insertion hole, through the temporary retention notch and hooking the binding member, which is in a state of being inserted through the temporary retention notch, onto the temporary retention projection (4, 40A, 40B) to achieve temporary retention of the binding member on the temporary retention projection (4, 40A, 40B); a routing step of routing the wiring member in the routing space in a state where the binding member is temporarily retained on the temporary retention projection (4, 40A, 40B); and a binding step of detaching the binding member, which is in a state of being temporarily retained by the temporary retention projection (4, 40A, 40B), from the temporary retention projection (4, 40A, 40B) and binding the wiring member, which is in a state of being routed in the routing space, to the main body by the binding member. an insertion step of inserting a binding member through an insertion hole of a protective member (1, 1A, 1B), the protective member (1, 1A, 1B) including: a main body that forms a routing space in which the wiring member is routed and has an opening that is open to one side in a first direction in the routing space; the insertion hole being a hole that is formed to penetrate the main body and through which the binding member can be inserted across inside and outside of the routing space; a temporary retention notch that is formed in a recessed shape at an end of the main body on a side of the opening in the first direction and allows insertion of the binding member in a state where the binding member is inserted through the insertion hole; and a temporary retention projection (4, 40A, 40B) that is formed to protrude from the main body toward a side of the temporary retention notch and capable of hooking and temporarily retaining the binding member in a state where the binding member is inserted through the temporary retention notch; a temporary retention step of inserting the binding member, which is in a state of being inserted through the insertion hole, through the temporary retention notch and hooking the binding member, which is in a state of being inserted through the temporary retention notch, onto the temporary retention projection (4, 40A, 40B) to achieve temporary retention of the binding member on the temporary retention projection (4, 40A, 40B); a routing step of routing the wiring member in the routing space in a state where the binding member is temporarily retained on the temporary retention projection (4, 40A, 40B); and a binding step of detaching the binding member, which is in a state of being temporarily retained by the temporary retention projection (4, 40A, 40B), from the temporary retention projection (4, 40A, 40B) and binding the wiring member, which is in a state of being routed in the routing space, to the main body by the binding member.