| CPC B23K 26/705 (2015.10) [B23K 26/142 (2015.10); B23K 26/21 (2015.10); B23K 26/0884 (2013.01)] | 5 Claims |

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1. A housing accommodating a sensor that detects an energy beam, the housing comprising:
a chamber provided with a beam-transparent member that allows the energy beam to pass; and
a supply port that supplies a gas into the chamber;
wherein the sensor detects the energy beam incident through the beam-transparent member,
the chamber is partitioned by a partition plate provided with the beam-transparent member,
the beam-transparent member is attached to the partition plate in a replaceable manner,
the partition plate is slid, whereby the beam-transparent member is pulled out of the housing,
the partition plate includes a stopper that limits a sliding amount of the partition plate, and
in a state in which the partition plate has been slid and thus the beam-transparent member has been pulled out of the housing, one end of the partition plate protrudes from one side of the housing and another end of the partition plate protrudes from another side of the housing.
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