An acoustic wave element comprising: a piezoelectric substrate, an excitation electrode which is on the piezoelectric substrate and comprises a plurality of electrode fingers, and two reflectors on the piezoelectric substrate, each of which comprises a plurality of reflection electrode fingers, which sandwich the excitation electrode therebetween in the propagation direction of an acoustic wave, wherein the excitation electrode comprises a main region in the vicinity of the center of the line of the plurality of electrode fingers in which the intervals between the centers of the plurality of electrode fingers are uniformly a first interval, each of the reflector comprises a shift part in which at least one of the reflection electrode fingers shifts to the excitation electrode side relative to virtual electrode finger positions which are repeatedly set at the first intervals from the electrode fingers in the main region, and an interval between the center of the reflection electrode finger in each reflector which is located in the end part on the excitation electrode side and the center of the respective electrode finger in the excitation electrode which is located in the end part on the reflector side is the first interval, wherein (i) in a first alternative, in the excitation electrode, an interval between the centers of two of the electrode fingers which are located on the reflector side and adjoin each other is singularly narrower than the first interval, or wherein (ii) in a second alternative, the plurality of the reflection electrode fingers comprises a first reflection electrode finger which is on the excitation electrode side and a second reflection electrode finger which is adjacent to the first reflection electrode finger and is on the opposite side to the excitation electrode, wherein an interval between the centers of the first reflection electrode finger and the second reflection electrode finger is narrower than the first interval, the second reflection electrode finger and at least one of the reflection electrode fingers which is on the opposite side to the excitation electrode relative to the second reflection electrode finger have an interval between their centers of the first interval or less and configure the shift part, and in each of the reflectors, every interval between the centers of the reflection electrode fingers which are adjacent to each other except the interval between the first reflection electrode finger and the second reflection electrode finger is the first interval. a piezoelectric substrate, an excitation electrode which is on the piezoelectric substrate and comprises a plurality of electrode fingers, and two reflectors on the piezoelectric substrate, each of which comprises a plurality of reflection electrode fingers, which sandwich the excitation electrode therebetween in the propagation direction of an acoustic wave, wherein the excitation electrode comprises a main region in the vicinity of the center of the line of the plurality of electrode fingers in which the intervals between the centers of the plurality of electrode fingers are uniformly a first interval, each of the reflector comprises a shift part in which at least one of the reflection electrode fingers shifts to the excitation electrode side relative to virtual electrode finger positions which are repeatedly set at the first intervals from the electrode fingers in the main region, and an interval between the center of the reflection electrode finger in each reflector which is located in the end part on the excitation electrode side and the center of the respective electrode finger in the excitation electrode which is located in the end part on the reflector side is the first interval, wherein (i) in a first alternative, in the excitation electrode, an interval between the centers of two of the electrode fingers which are located on the reflector side and adjoin each other is singularly narrower than the first interval, or wherein (ii) in a second alternative, the plurality of the reflection electrode fingers comprises (i) in a first alternative, in the excitation electrode, an interval between the centers of two of the electrode fingers which are located on the reflector side and adjoin each other is singularly narrower than the first interval, or wherein (ii) in a second alternative, the plurality of the reflection electrode fingers comprises a first reflection electrode finger which is on the excitation electrode side and a second reflection electrode finger which is adjacent to the first reflection electrode finger and is on the opposite side to the excitation electrode, wherein an interval between the centers of the first reflection electrode finger and the second reflection electrode finger is narrower than the first interval, the second reflection electrode finger and at least one of the reflection electrode fingers which is on the opposite side to the excitation electrode relative to the second reflection electrode finger have an interval between their centers of the first interval or less and configure the shift part, and in each of the reflectors, every interval between the centers of the reflection electrode fingers which are adjacent to each other except the interval between the first reflection electrode finger and the second reflection electrode finger is the first interval.