An imaging lens includes first to fourth lens units in order from the object side to the image side. The first, third, and fourth lens units have a positive refractive power. The second and fifth lens units have a negative refractive power. During focusing from an object at infinity to a close object, the first, third, and fifth lens units do not move, and the second and fourth lens units respectively move toward the image side and the object side. The fifth lens unit includes a fifth-a lens unit having a negative refractive power which moves in a direction having a component perpendicular to an optical axis to shift a image position, and a fifth-b lens unit having a positive refractive power. Focal lengths of the third lens unit, the entire system of the imaging lens, the fifth-a lens unit, and the fifth-b lens unit are adequately set.