A particulate sensor (1) includes an ion source (15) and a reference potential member (45). The particulate sensor (1) detects particulates S contained in a gas under measurement EG by means of ions CP. The ion source (15) includes a ceramic structure (100) having a ceramic laminate (101) and a discharge electrode member (110). The discharge electrode member (110) has an inter-layer portion (112A, 111) embedded between the layers of the ceramic laminate (101) and an exposed portion (112B) extending from the inter-layer portion (112A, 111) to a position outside the ceramic laminate (101). The discharge electrode member (110) generates the gaseous discharge between the reference potential member (45) and the exposed portion (112B) including one or more needle-shaped distal end portions (1125) upon application of a constant DC discharge potential PV2.