Light-emitting sealed body

A light-emitting sealed body comprising:

• a housing that houses a gas for generating plasma, the housing including a first window configured to cause first light for maintaining the plasma in a plasma region where the plasma is generated to be incident on the plasma region and a second window configured to emit second light emitted from the plasma from the plasma region;
• a first electrode having a first distal end facing the plasma region in the housing;
• a second electrode having a second distal end facing the plasma region in the housing, the second distal end facing the first distal end with the plasma region interposed therebetween;
• an insulating first holder holding the first electrode and fixed to the housing;
• and
• an insulating enclosure enclosing the plasma region, the first distal end, and the second distal end in the housing and having a first opening corresponding to the first window and a second opening corresponding to the second window,
• wherein at least a part of the enclosure is provided to the first holder.