  In this paper we examine Casimir effect in the case of tachyonic field, which
is connected with particles with negative four-momentum square. We consider
here only the case of one dimensional, scalar field. In order to describe
tachyonic field, we use the absolute synchronization scheme preserving Lorentz
invariance. The renormalized vacuum energy is calculated by means of Abel-Plana
formula. Finaly, the Casimir energy and Casimir force as the functions of
distance are obtained. In order to compare the resulting formula with the
standard one, we calculate the Casimir energy and Casimir force for massive,
scalar field.
