Even though it's a workplace practice, it interferes with free marriage at workplaces, which could be a violation of the freedom of marriage guaranteed under Article 24 of the Constitution.

If my significant other and I both worked at the Ikeda city hall and enjoyed or needed the money, we would not marry. Even if the female half were to become pregnant, she would take her maternity leave, but we would not marry. The city government is obviously penalizing and discouraging marriage- by halving our income if we do.

Japan staggers around at least 2 generations behind, and completely out of touch with, the advanced nations of the world. Sad.

Strangely enough many US and European companies got the same rule when 2 workers marry, ergo one has to leave.

Just ask them to explain the reasons for these archaic rules and practices and you will hear the sound of one hand clapping. A joke.

Strangely enough many US and European companies got the same rule when 2 workers marry, ergo one has to leave.

Many? Can you share some examples please?

This is not an archaic practice.  Newly introduced.  given the long hours at work here and limited ability for social interactions outside work for many people, there is a higher occurrence of people meeting and marrying in work.  If the relationship doesn't conflict with the couple's duties or place the employer at some risk, then not sure what the problem is.  that is certainly how many Western companies view this matter.

I know its a long stretch, but you control people from dividing them right? If two people marry and create a strong bond within the workplace and heaven forbid between separate departments this could equal trouble for those up top? Just brainstorming for what maybe the thought process behind this apparently NEW rule. Anyone that has experienced Japanese company life will know that often there is little dialog nor cooperation ( often quite the opposite! )  between different sections of the same company. The box effect shall we say.