The present invention relates to a carbon-fiber-precursor acrylic fiber bundle with an oil composition adhering thereto, wherein the oil composition comprises an amino-modified silicone, an aromatic ester compound (1) having a structure represented by the following formula (1), and an aromatic ester compound (2) having a structure represented by the following formula (2), the amino-modified silicone, the aromatic ester compound (1), and the aromatic ester compound (2) meet the specific requirements, the process for producing the same, an oil composition carbon-fiber-precursor acrylic fiber, and an oil composition dispersion for carbon-fiber-precursor acrylic fiber.