This research is motivated by the breaking of a marriage that has permanent legal power, there will be legal consequences that follow, one of them is about the custody of the child born of the marriage, while taking care of custody after divorce must have one party feel is more entitled to fulfill their children therefore this research has a purpose to know the Basic Consideration of Judges in the Religious Courts of Semarang in examining and adjudging the decision Number 0149 / Pdt.G / 2015 / PA.Smg regarding the delegation of child custody post the occurrence of a divorce.
This research is analytical descriptive and in this research using sociological juridical approach. Data collection techniques used are through research, judges and librarian decisions that is through books, legislation, documents and so forth. Data analysis using logical data analysis technique from result of research which have been done.
From the results of the research, the verdict found that the judge in deciding custody of the child saw several factors related to the circumstances of the individual who will take care of the child carefully, in order to benefit the child. Such factors are economic factors in which a child still needs education and life costs, the ability to educate children well and viewed from the mistake of who is the cause of the divorce. Then see that the judge can decide the existing case. in the verdict if the parent who gets custody, should not prevent others from meeting their child. of the judge's judgment with the verdict Number 0149 / Pdt.G / 2015 / PA.Smg the judge decides that the child is in the care of the mother, because the judge sees that the father is incompetent to take care of him for the reason that father's life is not good for his child.
The conclusion of this research is that in deciding custody the judge see some things like economic factor, ability to educate children and provide comfort for the child, able to give the whole affection to the child. The author's suggestion in this case is that the government should be more active in providing legal counsel on divorce, especially regarding the consequences felt by a child if both parents divorce. Counseling aims for people to grow with a sense of security, prosperity and avoid divorce because the family is a small part of society.

Keywords: Divorce, Child Custody