This thesis is intended to study on the roles of the Thai public prosecutors in criminal proceedings. It is viewed that the objectivity in criminal proceedings currently conducted by the public prosecutors should be increased in line with the roles of public prosecutors in an international system. Their roles in protection of the civil rights, provision of legal aid to citizens and legal development should also be improved at all times. The findings of the research has revealed that the public prosecutors in pursuing criminal prosecutions, either in the past or at present, still have had the notion that it would be sufficient if they have merely performed their duties in accordance with laws or rules. Such a notion has long been influenced by an accusatorial procedure. This has resulted in the ignorance of searching for the truth and the lack of objectivity in institution of criminal cases. Therefore, the Thai public prosecutors of a desirable type consistent with that in a universal system should be developed to be more objective. The public prosecutors should maintain justice by performing their functions impartially, expeditiously and transparently. Each stage of their functions should be capable of being reviewed and clearly expounded. They should take an active role without apathy and carry out their duties justly and courageously without any fear of intimidation. They should also act as the guardians of the public interest in prevention and suppression of crime. Moreover, they, without considering themselves as parties to the cases, should have duties to protect the rights of an accused or a defendant. Nevertheless, in order for the Thai public prosecutors’ roles to be more objective, the desirable type in line with those of the public prosecutors in the universal system, there should be implementation of the existing laws and the current rules on criminal proceedings concerned. Professional ethics should be coded to raise awareness for the Thai public prosecutors to act bravely and objectively. In additions, not only should they receive training in various fields, i.e. either general or professional knowledge, but also their functions in criminal proceedings should be publicized. With the change of the Thai public prosecutors into those of the ideal type, they, in criminal proceedings, will act with objectivity in the manner exactly consistent with the roles of the public prosecutors in the International system so that the justice could be done most efficiently for the citizens and the nation.
