A substrate for a light emitting device includes: a plurality of wiring patterns, each including: a first conductive pattern including: a light emitting element mounting region defined by a first, second, third, and fourth sides in a plan view, and a contact region; and a second conductive pattern surrounding a portion of the first side where the contact region is not present, an entirety of the second side, and a portion of or an entirety of the third side, wherein a first end portion of the second conductive pattern at the third side is positioned nearer to the fourth side than a second end portion of the second conductive pattern at the first side is to the fourth side. The third side of a second wiring pattern faces the first side of a first wiring pattern.