The Immigration Division is responsible for the procedures of permanent resident, residential certificate, alien registration, re-entry permit, extension of stay, issuance of permits, registrations and carrying out all matters which is under authority of the Immigration Commission.

The Immigration Division II is responsible for air transport control in order to inspect of persons and all air transports entering and leaving the kingdom through the Bangkok International Airport and other matters concerned.

The Immigration Division III is responsible for supervising the official activities of immigration officials attached to immigration check points in the rural areas so as to ensure their strict compliance with the present laws, regulations, orders and notices concerned. A rural administration is divided into 4 levels of 52 check points. It is also responsible for the procedures of immigration activities, inspection of persons and conveyances entering and leaving the kingdom by air, and surface and is responsible for the investigation and suppression of violators against the Immigration or Anti White Slavery Laws and other criminal offenses which lead to illegal immigration as well.

The Investigation and interrogation group is a subdivision level unit which report direct to the Commissioner and is responsible for the inspection of illegal aliens, investigation and suppression of violators against the Immigration or Anti White Slavery Laws and other criminal offenses which lead to illegal immigration.

Section  1 :This Act shall be called the Immigration Act, B.E. 2522
Section  2 :This Act shall be enforced after the lose of ninety days from the date of its  publication in the Government Gazette.
Section 3 :Immigration Acts :
                       1.B.E. 2493 ( 1950 )
                       2.B.E. 2497 ( 1954 NO.2 )
                       Shall be repealed
                       In lieu all others laws , regulations , or rules witch are provided for in this
Act or contradictory hereto or inconsistent herewith , the provision of this Act shall be applied.
Section 4 : In this Act :
           Alien means any person who is not of Thai nationality under the nationality Act.
           Conveyance means any vehicle or beast of burden or any other object(s) which may be used in conveying persons from one place to another.
           Owner of Conveyance includes an agent of the owner , a person renting, an agent if the person renting , possessor , or an agent of the possessor of the conveyance , as the case may be.
           Person in charge of conveyance means the master of the vessel or person responsible for the control of the conveyance.
           Crew of conveyance means the person who has a function , duty , or work in the conveyance , and in the interest of this Act , it includes the person in charge of conveyance driving the conveyance without a crew.
           passenger means any person other than the person in charge , or the crew of conveyance
           Immigrant means any alien who enters the Kingdom.
           Immigration Doctor means any doctor appointed by the Director General to carry out the provisions of this Act.
           House Master means any persons who is the chief possessor of a house , whether in the capacity of owner , tenant , or in any other capacity whatsoever , in accordance with the law on people act.
           Dwelling Place means any place used for habitation such as a house shed , boat or floating house which human beings inhabit .It also includes the precinct of the place used for habitation , whether it be enclosed or not , in accordance with the Panel Code.
           Hotel means any place built for remuneration for travelers or persons who wish to look for a place to stay or rest for a period of time , in accordance with the law on the hotels.
           Commission means The Immigration Commission.
           Competent Official means any officer appointed by the Minister to carry out a function in conformity with this Act.
           Director means Director General of the Police Department.
           Minister means the Minister in charge of this Act. Section 5 : The Minister of Interior shall be in charge and have control for the executive of this Act and shall have power to appoint competent officials , and Issue Minister Regulations ; to fix fees and other expense not exceeding rates annexed to this Act and to fix other activities for the execution of this Act. Such Ministerial Regulations shall become effective after having been published in the government Gazette.