The school subject computer science at the elementary level in the Republic of Croatia still isn't a mandatory school subject. That means that there is no obligation for elementary school students to attend this school subject. There are different reasons when some school subject can and must become a mandatory school subject in the Teaching plan and program. The authors have, as one of the basic condition that school subject computer science become a mandatory school subject in elementary school for all elementary school students, assumed the issue of students' interest in computer science. The sample selected for the study were elementary school students from higher grades (from 5th to 8th grade) from three elementary  schools in Čakovec (I. elementary school Čakovec, II. elementary school Čakovec, III. elementary school Čakovec). Sample consisted of 363 elementary school students. The basic method used to examine the interest of elementary school students for teaching computer science was the method of the survey. Survey consisted of two parts; the first part of the survey was filled out by all students who participated in the study (363 students), while the second part of the survey involved elementary school students (345 students) who attended the school subject computer science as an optional subject.