The present invention provides a cord bush that makes it possible to reliably inhibit a liquid such as water from running along a cord, the length of which can be adjusted, into a control box through as well as a microphone control box including the cord bush. A first flock layer 33 formed by electrostatically transplanting short fibers is provided along a guide hole 23 in a cord bush 22. This inhibits a liquid from infiltrating into a control box 12 through the gap between an electric cord 15 and a cord bush 22.