In a radiator, a large loop is formed by radiation conductors, first and second capacitors, and first and second inductors, and a small loop is formed by portions of the radiation conductors close to each other, the second capacitor, and the second inductor. The radiator is configured such that its first portion, second portion, and third portion resonate at predetermined frequencies, respectively. The first portion extends along the large loop, and includes the first inductor, the first capacitor, and one of the second inductor and the second capacitor. The second portion includes a section extending from a feed point to a second position through one of the first inductor and the first capacitor, and includes the small loop. The third portion includes a section extending from the feed point to the second position through the first capacitor.