Heterosis, gene action, combining ability (GCA and SCA) effects and variances were studied in 21 F₁ and F₂ crosses derived from 7x7 half diallel scheme of field bean. To detect prospective and efficient material for immediate use in breeding programs to enhance field bean productivity. F₁ and F₂ with parents were arranged in RCBD with 3 replicates to evaluate seed yield and its components traits in 2018/2019 season. Mean squares (MS) for genotype and its partitioning (parent, crosses and parent vs crosses) were significant for all studied traits in both generations. P₁xP₅ and P₃xP₆ exhibited significant heterotic effect for seed yield plant^-1 in F₁ and F₂ generations. Significant GCA and SCA MS were found for all studied traits, where proportion of additive was great for most traits in both generations, reveling predominance of additive gene effects. P₂ (Sakha 2), P₅ (M-13), P₇ (M-1017) in F₁ and P₆ (M-148) in F₂ were good combiners for seed yield and at least one of its components. More than 25 % of studied crosses showed positive and significant SCA effects for seed yield in F₁ and F₂ generations. The cross P₁xP₅ showed desirable SCA effects in both generation for seed yield and resistance to chocolate spot disease%. Significant and larger values of dominance component (H1) than additive were obtained for all studied traits resulting in more values of (H1/D)^0.5 which were exceeded unity in both generations. Low narrow-sense heritability was exhibited in both generations for all traits, indicating that presence of non-additive genetic effects.