This study examines the persistent weakness of the Indonesian Parliament oversight function. Although this oversight function is explicitly enshrined in the constitution and legislation, in practice it remains dependent on political calculations and the pragmatic stance of political parties. The aim of this study is to identify the causes of the weakness in the Indonesian Parliament’s oversight function and to propose measures to strengthen it in accordance with Indonesia’s constitutional framework, to ensure that Indonesian Parliament’s oversight function can be restored. This tudy employs a doctrinal method, combining an analysis of legislation with a conceptual approach. The research findings confirm that political parties are highly prone to engaging in practical politics by prioritising party interest, which hinders the Indonesia Parliament’s oversight function. This study concludes that these obstacles include party cartelisation, power relations, high parliamentary thresholds, conflicts of interest, and the urgent need to revise thr Political Parties Act and the Election Act
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