A door checker for a vehicle includes a hinge rotatably connecting a door to a vehicle body and having a shaft, a slider penetratingly inserted into the shaft and linearly moving with rotational force of the shaft, and a checking unit linearly reciprocating in a radial direction of the shaft by the slider. By implementing a manipulation feeling in opening and closing a door by increasing a section for checking the door by converting a rotational movement of the door into a linear movement based on a screw principle, operability can be improved to enhance marketability, and durability can be enhanced by increasing the section for implementing operating force for opening and closing a door.