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Grinding of weld toes is generally used to improve the fatigue strength of fillet weld joints. In this study, a technique employing additional welds was applied to out-of-plane gusset welded joints and the relationship between the shape of the additional weld and fatigue strength was investigated. The shape of the additional weld was controlled by changing the aiming position. When there was more distance between the first weld toe and the aiming position of the additional weld, the flank angle and toe radius tended to be smaller and larger, respectively. In the nominal stress range of 150 MPa, fatigue life was extended to 2.7 times that of weld joints without additional welds. Although the toe radius of the additional weld was smaller than that created by grinding, the resultant fatigue strength of the additional weld joint was almost equivalent to that of the grinding case. This can be explained in terms of stress concentration, since the flank angle and toe radius in the additional weld toe can be improved without reducing the throat thickness.