Criminal justice system for juvenile is defined as specific criminal proceedings for juveniles and thus manifest certain procedures for protecting
juvenile suspect being accused of having committed alleged crime. In 2010, Thailand enacted the new Act for the Establishment of and Procedures for
Juvenile and Family Court B.E.2553 (2010) which came into force on 21 May 2011. This thesis has explored this new piece of legislation and found that there are some shortcomings under such Act in which the right protection measures for optimum interest of juvenile have not been adopted. Having comparing with criminal proceedings for juvenile in other jurisdictions including Canada, the UK, the Philippines, the Japan and the Vietnam it is found that although all other mentioned countries are the member state to the Convention on the Rights of the Child as the same as Thailand, their procedural principles partly differ from those of Thailand due to difference in the context of each country. However, these countries share the same standpoint to protect the child and juvenile in their country based on the principle of ultimate interest of the child. Thailand should therefore refer to certain advantageous criminal procedures for juvenile adopted in other jurisdictions as a guideline form revision of relevant legislations to ensure fairness for juvenile suspect.