Electric connection box and wire harness

A wire harness comprising:

• an insulating casing;
• a plurality of internal electric wires;
• at least one internal electric part that is accommodated inside the casing and is electrically connected to the plurality of internal electric wires drawn from an inside to an outside of the casing;
• at least one external electric wire;
• and
• a terminal block that is provided with at least one external electric part electrically connected to the at least one external electric wire and is assembled into the casing outside the casing, wherein
• the casing includes an accommodation member that accommodates the internal electric part, and a removable member that is attached to and detached from the accommodation member,
• the terminal block includes a holding member that holds the external electric part, and
• the holding member is formed as one part integrated with the removable member.