A writing implement core is positioned in a tube, which has first and second step-shaped ends with threads; a head sleeve is threadedly joined on the second end of the tube with the writing core sticking out therefrom; a shell is threadedly joined on one of the ends of the tube, and can be reloacted relative to the tube to adapt the writing implement for use as a chopstick; a cap is provided, which can be positioned around the tube to cover the writing core; a chopstick member is threadedly joined on the first end of the tube; when the shell is joined on the first end of the tube, it will cover the chopstick member, and the writing implement and chopstick combination can be used as a writing implement; the combination can be used as a chopstick after the shell is relocated on the second end of the tube.