The present invention relates to a pitching training aid for shadow pitching training, the pitching training aid comprising: a receiving body which includes an inner receiving space and has openings at both sides thereof, and replicates a baseball in a state where a user encompasses and holds the receiving body with his/her hand or wears the receiving body on his/her fingers through the receiving space; a locking holder which is detachably inserted and fixed in the receiving space through the opening of the receiving body, and provides a locking region where locking through-holes are formed in the longitudinal direction, so as to allow at least one finger to be fitted and locked into the locking holder in the longitudinal direction, the locking holes extending in a curved shape having a predetermined curvature; and an elongated body which has a rod shape extending a predetermined length from one side of the receiving body, and provides load and vibration while being elastically deformed and restored by rotation of a user's arm.