tabular example

\documentclass[uplatex,twocolumn]{jsarticle}
\usepackage{booktabs}
\begin{document}
\section{例}
\begin{table}[h]
\centering
\caption{中古車の品質と価格の低下}
\begin{tabular}{c@{}rcc@{}cccc@{}rc}
\toprule[1pt]
\multicolumn{2}{c}{買い値}&
\multicolumn{4}{c}{\parbox{7zw}{売り出し中の車の最高点}}&
\multicolumn{4}{c}{\parbox{7zw}{売り出し中の車の平均点}} \\
\midrule
&&\makebox[2zw]{}&&10&\makebox[2zw]{}&\makebox[2zw]{}&→&5&\makebox[2zw]{}\\
→&75&&→&7&&&→&3.5&\\
→&52.5&&→&5&&&→&2.5&\\
→&37.5&&→&3&&&→&1.5&\\
→&22.5&&→&2&&&→&1&\\
→&15&&→&1&&&→&0.5&\\
→&7.5&&→&0&&&→&0&\\
&0&&&0&&&&0&\\
\bottomrule
\end{tabular}
\end{table}
\end{document}