In a spindle device (10) having a built-in motor, a flinger (40) is fixed to one end side of a rotation shaft (11), and a labyrinth seal (44) is formed between the flinger (40) and a housing H. The housing H includes at least one bypass hole (24) that allows a motor chamber (34) having a motor (30) arranged therein and the labyrinth seal (44) to communicate with each other. Thereby, water-resistance performance can be improved and damage to a bearing can be prevented.
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